Fix for #845 - Move the modules upgrade to the end of the migration process

Added 149 commits:

• ad216d73...e7933818 - 148 commits from branch vtiger:master
• 9548dfae - Merge branch 'master' into Fix_845_Migration_Process

Need to review - if migration scripts assumes existence of few modules and aims roll changes on them and this gets missed due to move at later.