Set group creator as group admin

Set group creator as group admin unless he already have authz rights on
the group (he is VO manager)
Add topGroupCreator to method manageRole

 - topGroupCreator was not supported in method manageRole
  - add to remove part
  - add to add part
Merge pull request #548 from stavamichal/addTopGroupCreatorRoleToManageRole

Add topGroupCreator to method manageRole
TopGroupCreator can get vo by method getVoByShortname

 - add privileges for topGroupCreator to method getVoByShortname
Merge pull request #549 from stavamichal/topGrCreatorCanGetVoByShortName

TopGroupCreator can get vo by method getVoByShortname