Partial-Bug: #1394419 - Adding Webui to Ubuntu Packaging + RPM Webui conf changes

This checkin:
- Adds the web-server-manager and web-core debians to the installer package
- Allows the install of Webui components through install script
- Updates config changes to RPM install script (Webui conf changes)
- Makes sure that Server Manager RPM/DEB install also acts as upgrade (saves config and replaces)
- WEBUI from installer setup Tested working on Centos

Patch 2:
- Saves tags.ini under /etc/contrail_smgr/ before install and replaces post install

Patch 3:
- Minor bug fix + Ubuntu config saving support

Patch 4:
- Minor install bug fix

Patch 5:
- Removed State saving in pre and post install of Centos and Ubuntu Smgr

Change-Id: Iaa9f1985fd76b5756a92b83cc3336b96038fca9c