Ticket #47819 - RFE - improve tombstone purging performance
Description: Initialize replica->precise_purging with slapi_counter_new().
https://fedorahosted.org/389/ticket/47819
Reviewed by mreynolds@redhat.com (Thanks, Mark!!)
(cherry picked from commit fb390315e3ea49a3bae6fb508333347f8c3a6807)