Merge branch '2.0'

Conflicts:
	devops/driver/dummy/dummy_driver.py
	devops/models.py
	devops/tests/test_models.py
Fix imports
functions to get xml description and to update devices
Boot tag in all devices.
boot order should have None by default
Set emulator to /usr/bin/kvm
Set uuid if it exists
Remove unused node_xml_description.
Remove unused update_devices method
Revert INSTALLED_APPS setting
Database migration script
Fix dropping devops_externalmodel tabel
Move migration script to migrations folder
readme.md

migration readme file
:set nobomb for migration_from_2.0.sql
Using SQLite3 database
Updating migrations for sqlite3 database engine