Merge pull request #2529 from edx/jibsheet/rotate-mongo-logs

Rotate mongodb.log and serverStatus.log independently

playbooks/roles/mongo_3_0/templates/mongo_logrotate.j2

-{{ mongo_log_dir }}/*.log {
+{{ mongo_log_dir }}/serverStatus.log {
+  create
+  compress
+  copytruncate
+  delaycompress
+  dateext
+  dateformat -%Y%m%d-%s
+  missingok
+  notifempty
+  daily
+  rotate 90
+  size 1M
+}
+
+{{ mongo_log_dir }}/mongodb.log {
   create
   compress
   copytruncate