Fixed Below Issue
1)Moved /api/admin/webconfig/xxx/yyy defination to Core package from Controller
2)Handled nulls for features disbaled entry in config

Change-Id: I95c3eebd5c60a80ad41299fe5f60e59d3778b53b
Merge "Fixed Below Issue 1)Moved /api/admin/webconfig/xxx/yyy defination to Core package from Controller 2)Handled nulls for features disbaled entry in config"