Add service registration methods to PZH internal API
Add service registration methods to PZH internal API

Adds listing registered and unregistered services methods. Also adds
registering and unregistering service methods. These methods are used
by the PZH web admin UI.

Jira-issue: WP-9

hansmy/Webinos-Platform,webinos/Webinos-Platform,webinos/Webinos-Platform,krishnabangalore/Webinos-Platform,webinos/Webinos-Platform,krishnabangalore/Webinos-Platform,webinos/Webinos-Platform,webinos/Webinos-Platform,webinos/Webinos-Platform,krishnabangalore/Webinos-Platform,krishnabangalore/Webinos-Platform,webinos/Webinos-Platform,krishnabangalore/Webinos-Platform,hansmy/Webinos-Platform,hansmy/Webinos-Platform,hansmy/Webinos-Platform,webinos/Webinos-Platform,webinos/Webinos-Platform,hansmy/Webinos-Platform,krishnabangalore/Webinos-Platform,krishnabangalore/Webinos-Platform,hansmy/Webinos-Platform,krishnabangalore/Webinos-Platform,hansmy/Webinos-Platform,hansmy/Webinos-Platform,krishnabangalore/Webinos-Platform,hansmy/Webinos-Platform