renaming; fixes 

Fix template rendering bug 

change action syntax 

bugfix for opvn status date layout 

Merge pull request palark#1 from pashcovich/draft-password-auth Additional password auth Multiple mgmt interface usgae Layout changes Small fixes

Fix server certs expire metrics math 

Code refactoring to singleton; Added metrics 

Bug fixes; Small changes for slave UI 

Fixed slave server crashed issue if the master is unvailable 

Addded master-slave mode for openvpn-admin