Adding provision to have the feature packages to do initialization upon jobServer Start Adding API featureInit() which the feature package should call if they want some initialization in webroot/common/api/init.api.js file

Change-Id: I682b9a0f81857d4537efea9fdea78940b73288f3
(cherry picked from commit 85cb5cf3b3182eabacb0b430037ba9c273fa1e2f)
Merge "Adding provision to have the feature packages to do initialization upon jobServer Start Adding API featureInit() which the feature package should call if they want some initialization in webroot/common/api/init.api.js file" into R2.0