created VMWare/RHEVM api abstraction layer

   # This is a combination of 8 commits.
   # The first commit's message is:
   initial revision for VMWare/RHEVM api work

   # This is the 2nd commit message:

   added class level comments
   added list_vm() to rhevm

   # This is the 3rd commit message:

   added start_vm and stop_vm for RHEVM
   added docstrings for start_vm and stop_vm in base class
   added destructor in RHEVMSystem.py

   # This is the 4th commit message:

   added implementation for stop_vm(), restart_vm(), delete_vm() for RHEVMSystem
   added docstrings for stop_vm(), info(), create_vm(), restart_vm(), delete_vm()

   # This is the 5th commit message:

   filled in start_vm/stop_vm/restart_vm/list_vm/delete_vm for VMWareSystem
   minor tweaks to RHEVM exception msg

   # This is the 6th commit message:

   removed __del__ and moved the content to disconnect()
   reason for this change is that a segmentation fault results from RHEVMSystem() when self.api.disconnect() is called in the destructor

   # This is the 7th commit message:

   oops forgot to put the right call back to constructor

   # This is the 8th commit message:

   pylint cleanup
   merge files together to form one cohesive module
test RBAC menu access based on default LDAP group roles

test RBAC menu access based on default LDAP group roles
updated data and credentials templates
fixed port validation rhev vs vsphere

added rhevm31 to test param