Parameters
This function takes the following parameters:
- 
entry_to_check
- 
The entry in which the presence of a role is to be checked. 
- 
role_dn
- 
The DN of the role for which to check. 
- 
present
- 
Pointer to an integer where the result is placed. For results: 
- 
non 0 means present 
- 
0 means not present