Ticket 47383 - connections attribute in cn=snmp,cn=monitor is counted twice
Bug Description: In disconnect_server_nomutex() we increment, instead of decrement
the connection counter.
Fix Description: Decrement the counter. Also did some code cleanup.
https://fedorahosted.org/389/ticket/47383
Reviewed by: Richm(Thanks!)
(cherry picked from commit 202c9831194558a7439da815f6627993ce1a17db)