Replace assertEqual(None, *) with assertIsNone in tests

Replace assertEqual(None, *) with assertIsNone in tests to have
more clear messages in case of failure.

Change-Id: Ifbb144e26b62790d8b8ba9b5c3eea7d04844ee19
Closes-Bug:#1280522
Remove vim header

No need to set tabstop tons of times, this can be set in your vimrc
file instead.

More disucssion:
http://openstack.10931.n7.nabble.com/Remove-vim-modelines-td21780.html

Change-Id: I45766d91f0c0b3622bbdc7dc5517497c87ebee8c
Closes-Bug: #1229324
Merge "Replace assertEqual(None, *) with assertIsNone in tests"
Adding datastore_version column to instances list table

Change-Id: Ieef6b41d97c71ffd4099c199c1221f23628012db
Closes-Bug: #1279952