OF-832 Monitoring plugin fixes

* Fixed request conversations and messages
* Now conversations list is sorted
patch by koledas
OF-460: Persist log.debug.enabled property

Fix settings for debug log so the admin UI setting is retained across
restarts. The system property "log.debug.enabled" may also be used to
manage this setting. If provided via openfire.xml, the property will be
migrated into the DB during startup.
OF-830: Do not use JID-escaping for group names

Fixes roster group sharing when using the LDAP provider for users and
groups, by reverting part of an earlier fix (OF-779).
Provide better defaults for Roster cache

The username2roster cache was use the Openfire defaults of 256k/6hrs
which is not optimal for a base installation. This sets the default max
size to 1M and set the expiry to 30 minutes.
Merge pull request #95 from tevans/master

Provide better defaults for Roster cache
Merge pull request #92 from akrherz/of832

OF-832 Monitoring plugin fixes
Merge branch 'master' of https://github.com/igniterealtime/Openfire
Upgrade bouncycstle from 1.50 to 1.51