Move all add/remove methods working with table authz to AuthzResolver

- all methods stay in BlImpl and will call methods from AuthzResolverBl
- after removing/add info to table authz use refreshAuthz method
- rework admin methods for GroupsManager, VoManager and FacilityManager
- move all part of code adding or removing something to/from table authz
Add synchronization of refreshAuthz in AuthzResolverBlImpl
Merge pull request #203 from stavamichal/Move-all-add-remove-methods-working-with-authz-to-AuthzResolver

Move all add/remove methods working with table authz to AuthzResolver

- All methods stay in BlImpl and will call methods from AuthzResolverBl.
- After removing/add info to table authz use refreshAuthz method.
- Rework admin methods for GroupsManager, VoManager and FacilityManager.
- Move all part of code adding or removing something to/from table authz.

Add synchronization of refreshAuthz in AuthzResolverBlImpl
Add remove methods for group_resource and group attributes

- add method removeAttributes for group and resource able to remove also group attributes
- add method removeAllAttributes for group and resource able to remove also all group attributes
- add these methods also to RPC
- add simple tests for those two methods
New method getResourceRequiredAttributes

- add method getResourceRequiredAttributes from resource for group_resource and group attributes
- method has parameter "workWithGroupAttributes" 
- add simple test for this method
- fix of javadoc in AttributesManagerBl (PrivilegeException is not correct here)
Merge pull request #212 from stavamichal/removeAttributes_for_group_and_group_resource_attributes

- Add method removeAttributes for group and resource able to remove also group attributes
- Add method removeAllAttributes for group and resource able to remove also all group attributes
- Add these methods also to RPC
- Add simple tests for those two methods
Merge branch 'getResourceRequiredAttributes_for_group_resource_and_group' of https://github.com/stavamichal/perun into stavamichal-getResourceRequiredAttributes_for_group_resource_and_group

In order to fixup issues commented on GitHub.
CORE: small fixes to implementation of getResourceRequiredAttributes()

- Save up db query when checking if group and resource are from the same VO.
- Throw ConsistencyErrorException if method retrieves attributes from different
  namespace than group, group_resource.
- Trimmed whitespace
New method getResourceRequiredAttributes #213

- Add method getResourceRequiredAttributes from resource for group_resource and group attributes
- Method has parameter "workWithGroupAttributes"
- Add simple test for this method
- Add method also to rpc
- Fix of javadoc in AttributesManagerBl (PrivilegeException is not correct here)