This PR fixes mixlib-shellout failures in our CI infrastructure.

The failures were due to: 

1-) Failing output expectancies due to deprecation message from rubygems
2-) Hard coded user names and password for test accounts
3-) Jenkins service didn't have the "Replace process level token permissions"
4-) ENV['PATH'] pointed to ruby binaries before windows system level paths that caused a different whoami.exe being executed on the test boxes. 

We need to be mindful of 3 & 4 while coming a more reliable way to build our CI infrastructure.