Fixed RHEL6 variant detection

- Search for first X.Y where X & Y are digits, if X is 6 then we're
  assumed to be on a RHEL6 variant
Add ability to rollback the cib
Fixed pcsd start when IPv6 is disabled

Fallback to IPv4 if IPv6 is not available.
Add ability to backup and restore cluster configuration
Bumped to 0.9.124
Updated dependent gems
Bumped to 0.9.125
Disabled installation of /etc/init.d script until extra code is added to test for initdir in Makefile
Bumped to 0.9.126
Fix cluster setup tests

Do not check for real cib.xml when running cluster setup tests
Improve .gitignore in test directory

Ignore temporarily files created during test.
corosync: Add token_coefficient option

Add option for set token_coefficient in corosync.conf.
Fixes to the test suite for cib version 2.1
Add RRP support in adding and removing nodes
Add RRP support to GUI
Add corosync totem options to 'Create Cluster' dialog
Remove fence device from fencing levels on delete
Add tooltips to the resource dialog in gui
Add support for location rules to gui
Add ordering constraint actions to gui