Add regex for dialog password fields.

[lfu]

To hide the password value in evm.log like these:

[----] I, [2018-09-04T11:52:30.068959 #12301:c27108]  INFO -- : Q-task_id([miq_provision_3]) MIQ(ManageIQ::Providers::Vmware::InfraManager::Provision#log_clone_options) Prov Options: [:"password::password_field"](String) = "v2:{SEZAjnaOSeyzt387/rAooQ==}"
[----] I, [2018-09-04T11:52:30.069053 #12301:c27108]  INFO -- : Q-task_id([miq_provision_3]) MIQ(ManageIQ::Providers::Vmware::InfraManager::Provision#log_clone_options) Prov Options: [:"password::dialog_password_field"](String) = "v2:{SEZAjnaOSeyzt387/rAooQ==}"

Part of ManageIQ/manageiq-automation_engine#228.

https://bugzilla.redhat.com/show_bug.cgi?id=1619385

@miq-bot assign @gmcculloug
@miq-bot add_label bug, gaprindashvili/yes, automate

[miq-bot]

Checked commit lfu@2247c8a with ruby 2.3.3, rubocop 0.52.1, haml-lint 0.20.0, and yamllint 1.10.0
2 files checked, 0 offenses detected
Everything looks fine. 🏆

[JPrause]

@miq-bot add_label blocker

[simaishi]

Gaprindashvili backport details:

$ git log -1
commit 043a181fe873034556cd0783bef4e71ab8d0e8fa
Author: Greg McCullough <gmccullo@redhat.com>
Date:   Thu Sep 13 17:16:52 2018 -0400

    Merge pull request #17986 from lfu/password_log_1619385
    
    Add regex for dialog password fields.
    
    (cherry picked from commit cadcbc726d83f8a6e87421f48aa0b1c8f0ccff46)
    
    https://bugzilla.redhat.com/show_bug.cgi?id=1634808