Create tests for functions PMFCreateUsers and PMFPauseCase

Added files TestPMFCreateUsers.java and TestPMFPauseCase.java
Create function userExists() for find users by userName
Merge remote-tracking branch 'upstream/master' into PMFCreateUser
Merge pull request #183 from ernestvegap/PMFCreateUser

Create tests for functions PMFCreateUsers and PMFPauseCase