606920 - anonymous resource limit - nstimelimit -
also applied to "cn=directory manager"
https://bugzilla.redhat.com/show_bug.cgi?id=606920
Description: When a timelimit (as well as a sizelimit) is successfully
retrieved from SLAPIResLimitConnData, the value is always set to pblock.
With this change, it sets "no limit (-1)" if the operation is initiated
by Directory Manager.