First version without unit tests running

Added support to check 25 users in Zentyal Cloud slave mode and master mode
Added check for slave number
Fix unit tests and check properly the slave number

+ Added users module checks for SB:
  - No more than 25 users having none or cloud as master
  - Zentyal server slaves are forbidden

Please note, Zentyal Cloud slave is not taken into account when counting the number of slaves
Added public doc for EBox::UsersAndGroups::slaves method
Merge branch 'ejhernandez/smb-users-check'

Conflicts:
	main/remoteservices/ChangeLog