oo-diagnostics: add test_sshd_permit_root_login

Add test_sshd_permit_root_login for node hosts to verify that root logins
are permitted in order to facilitate moving gears using oo-admin-move.

This commit fixes bug 1140882.
Merge pull request #5807 from Miciah/bug-1140882-oo-diagnostics-should-verify-that-PermitRootLogin-is-enabled-on-nodes-for-oo-admin-move

Merged by openshift-bot
Bug 1141304 - use full path for pwck
Bug 1141304 - Add path to facts calls
Merge pull request #5809 from jwhonce/bug/1141304

Merged by openshift-bot
Bug 1139280 - Allow postgresql upgrade to pass when data/ was erased by user
Bug 1135941 - Finish setup for 10gen cartridge when the agent code is missing.
o-a-c-team: typo per bug 1141848

https://bugzilla.redhat.com/show_bug.cgi?id=1141848
Merge pull request #5812 from sosiouxme/bz1141848

Merged by openshift-bot
Merge pull request #5811 from mfojtik/bz1135941

Merged by openshift-bot
Updated documentation about pg_hba.conf
Merge pull request #5810 from mfojtik/bz1139280

Merged by openshift-bot
gear-placement plugin: improve docs and examples

Noted clearly how server_infos are filtered prior to invoking the plugin
method. Also revised the examples to add logging, adjust idiom, etc.