[Automation] Replacing []byte return type with string for test utils

[pshahzeb]

Quick refactoring to change return type of utils from []byte to string so that we avoid conversions else where in the tests
Testing:
test-all target passes locally.
The end output of test-all target

PASS
coverage: 40.6% of statements

exact test output of e2e-test

=== RUN   Test
2017/05/24 04:40:48 START: basic-test.TestVolumeIsolation
2017/05/24 04:40:48 Creating volume [basic_test_volume_1495600848] on VM [10.192.33.29]
2017/05/24 04:40:50 Checking volume [basic_test_volume_1495600848] availability from VM [10.192.33.29]
2017/05/24 04:40:51 Checking volume [basic_test_volume_1495600848] availability from VM [10.192.33.29]
2017/05/24 04:40:52 Destroying volume [basic_test_volume_1495600848]
2017/05/24 04:40:52 END: basic-test.TestVolumeIsolation
2017/05/24 04:40:52 START: basic-test.TestVolumeLifecycle
2017/05/24 04:40:52 Creating volume [basic_test_volume_1495600852] on VM [10.192.33.29]
2017/05/24 04:40:54 Checking volume [basic_test_volume_1495600852] availability from VM [10.192.33.29]
2017/05/24 04:40:55 Attaching volume [basic_test_volume_1495600852] on VM [10.192.33.29]
2017/05/24 04:40:57 Confirming attached status for volume [basic_test_volume_1495600852]
2017/05/24 04:40:59 Removing container [basic_test_container_1495600852] on VM [10.192.33.29]
2017/05/24 04:41:00 Confirming detached status for volume [basic_test_volume_1495600852]
2017/05/24 04:41:03 Destroying volume [basic_test_volume_1495600852]
2017/05/24 04:41:03 Checking volume [basic_test_volume_1495600852] availability from VM [10.192.33.29]
2017/05/24 04:41:04 Creating volume [basic_test_volume_1495600852] on VM [10.192.33.29]
2017/05/24 04:41:06 Checking volume [basic_test_volume_1495600852] availability from VM [10.192.33.29]
2017/05/24 04:41:07 Attaching volume [basic_test_volume_1495600852] on VM [10.192.33.29]
2017/05/24 04:41:08 Confirming attached status for volume [basic_test_volume_1495600852]
2017/05/24 04:41:10 Removing container [basic_test_container_1495600852] on VM [10.192.33.29]
2017/05/24 04:41:11 Confirming detached status for volume [basic_test_volume_1495600852]
2017/05/24 04:41:14 Destroying volume [basic_test_volume_1495600852]
2017/05/24 04:41:15 Checking volume [basic_test_volume_1495600852] availability from VM [10.192.33.29]
2017/05/24 04:41:16 END: basic-test.TestVolumeLifecycle
2017/05/24 04:41:16 Creating volume [restart_test_volume_1495600876] on VM [10.192.33.29]
2017/05/24 04:41:18 START: restart_test.TestPluginKill
2017/05/24 04:41:18 Attaching volume [restart_test_volume_1495600876] on VM[10.192.33.29]
2017/05/24 04:41:19 Confirming attached status for volume [restart_test_volume_1495600876]
2017/05/24 04:41:21 Killing vDVS plugin on VM [10.192.33.29]
2017/05/24 04:41:23 Sleep for 2 seconds
2017/05/24 04:41:25 Stopping container [restart_test_container_1495600876] on VM [10.192.33.29]
2017/05/24 04:41:37 Starting container [restart_test_container_1495600876] on VM [10.192.33.29]
2017/05/24 04:41:38 Stopping container [restart_test_container_1495600876] on VM [10.192.33.29]
2017/05/24 04:41:49 Confirming detached status for volume [restart_test_volume_1495600876]
2017/05/24 04:41:52 END: restart_test.TestPluginKill
2017/05/24 04:41:52 Removing container [restart_test_container_1495600876] on VM [10.192.33.29]
2017/05/24 04:41:52 Destroying volume [restart_test_volume_1495600876]
2017/05/24 04:41:53 Creating volume [restart_test_volume_1495600913] on VM [10.192.33.29]
2017/05/24 04:41:55 START: restart_test.TestVolumeStaleMount
2017/05/24 04:41:55 Attaching volume [restart_test_volume_1495600913] on VM [10.192.33.29]
2017/05/24 04:41:57 Confirming attached status for volume [restart_test_volume_1495600913]
2017/05/24 04:41:59 Killing docker on VM [10.192.33.29]
2017/05/24 04:41:59 Sleep for 2 seconds
2017/05/24 04:42:01 Confirming detached status for volume [restart_test_volume_1495600913]
2017/05/24 04:42:25 END: restart_test.TestVolumeStaleMount
2017/05/24 04:42:25 Removing container [restart_test_container_1495600913] on VM [10.192.33.29]
2017/05/24 04:42:26 Destroying volume [restart_test_volume_1495600913]
2017/05/24 04:42:27 Finding VM name from IP Address [10.192.33.29]
2017/05/24 04:42:28 START: Test vmdkops service restart + kill vm process
2017/05/24 04:42:28 Creating volume [vmlistener_test_volume_1495600948] on VM [10.192.33.29]
2017/05/24 04:42:30 Attaching volume [vmlistener_test_volume_1495600948] on VM [10.192.33.29]
2017/05/24 04:42:32 Confirming attached status for volume [vmlistener_test_volume_1495600948]
2017/05/24 04:42:34 Restarting vmdkops service on ESX host [10.192.35.13]
2017/05/24 04:42:37 Confirming attached status for volume [vmlistener_test_volume_1495600948]
2017/05/24 04:42:40 Retrieving VM power state for [ubuntu-VM0.0]
2017/05/24 04:42:41 VM[ubuntu-VM0.0]'s current power state is [poweredOn]
2017/05/24 04:42:41 Retrieving World ID for VM [ubuntu-VM0.0] from ESX [10.192.35.13]
2017/05/24 04:42:42 VM's process ID is: 1961726
2017/05/24 04:42:42 Killing VM from ESX [10.192.35.13]
2017/05/24 04:42:43 Sleep for 10 seconds
2017/05/24 04:42:53 Retrieving VM power state for [ubuntu-VM0.0]
2017/05/24 04:42:54 VM[ubuntu-VM0.0]'s current power state is [poweredOff]
2017/05/24 04:42:55 Powering on VM [ubuntu-VM0.0]
2017/05/24 04:42:57 Sleep for 35 seconds
2017/05/24 04:43:32 Retrieving VM power state for [ubuntu-VM0.0]
2017/05/24 04:43:33 VM[ubuntu-VM0.0]'s current power state is [poweredOn]
2017/05/24 04:43:33 Confirming detached status for volume [vmlistener_test_volume_1495600948]
2017/05/24 04:43:36 END: Test vmdkops service restart + kill vm process
2017/05/24 04:43:36 Destroying volume [vmlistener_test_volume_1495600948]
OK: 5 passed
--- PASS: Test (169.48s)

[shaominchen]

Thanks for taking care of this!

[shuklanirdesh82]

fixed #1289