Implemented round robin over 2*locked amount
ldap connections to make max_uses working properly.

Without this the first sessions are reconnected
very frequently, while the last ones stay for
long time.

	modified:   src/modules/rlm_ldap/rlm_ldap.c
Merge branch 'v2.x.x' of github.com:LarsKollstedt/freeradius-server into v2.x.x