Resign the drone secrets (fixes #1961)

[shuklanirdesh82]

#fixes #1961

Testing Done: Yes
invoked following command and made sure that CI has started.

nshukla-mbp:docker-volume-vsphere nshukla$ git tag -a -m "0.15 Release for June 2017" 0.19
nshukla-mbp:docker-volume-vsphere nshukla$ git push vmware 0.19
Counting objects: 4, done.
Delta compression using up to 8 threads.
Compressing objects: 100% (4/4), done.
Writing objects: 100% (4/4), 3.68 KiB | 0 bytes/s, done.
Total 4 (delta 1), reused 0 (delta 0)
remote: Resolving deltas: 100% (1/1), completed with 1 local object.
To https://github.com/vmware/docker-volume-vsphere.git
 * [new tag]         0.19 -> 0.19

Corresponding CI link: https://ci.vmware.run/vmware/docker-volume-vsphere/1701