Ticket 123 - Enhancement request:"whoami" extended operation

Description:
whoami extended operation plugin that fetches the client authzid
associated with the client.

Reviewed by: nhosoi
https://fedorahosted.org/389/ticket/123
Ticket 123 - Enhancement request:"whoami" extended operation

Description:
Makefile and template-dse.ldif.in containing whoami plugin
configuration

Reviewed by: nhosoi
https://fedorahosted.org/389/ticket/123
Ticket 123 - Enhancement request:"whoami" extended operation

Description:
Fixed compiler warning
fix compiler warnings, caused by fix for 47395,47397
Coverity Fixes

13177 - Unreachable code (backend.c)
13175 - Resource leak (repl5_ruv.c)

Did code cleanup in libaccess/oneval.cpp before I do the fix for 13176(resource leak).
This is will be a separate commit.

https://bugzilla.redhat.com/show_bug.cgi?id=970221

Reviewed by: richm(Thanks!)