Certificate addition support to mon and ro charms

This commit adds the `certificates` config in both RO and MON charms.

Changes:
 - Add `certificates` config option in mon and ro charms
 - Use charmed-osm/ops-lib-charmed-osm library in all charms

Change-Id: I14e3cf7ad2c846c4a2af57f317d4151119ce5fbb
Signed-off-by: David Garcia <david.garcia@canonical.com>
diff --git a/installers/charm/nbi/requirements.txt b/installers/charm/nbi/requirements.txt
index f10a199..1a8928c 100644
--- a/installers/charm/nbi/requirements.txt
+++ b/installers/charm/nbi/requirements.txt
@@ -19,4 +19,4 @@
 # osm-charmers@lists.launchpad.net
 ##
 
-git+https://github.com/davigar15/ops-lib-charmed-osm/@e7f26cd29b322e175a23cadbe4546b7f2bbf111c
\ No newline at end of file
+git+https://github.com/charmed-osm/ops-lib-charmed-osm/@master
\ No newline at end of file