Unit tests script for fuel-library

Script that will run unit tests (rake spec) for needed modules as
a part of our CI for fuel-library project. Currently it has a list
of modules with disabled unit tests, due to large amount of broken
or missing rspec tests. We'll fix those eventualy and reduce the
list of modules without unit tests.

Also includes:
  - fixes for swift unit tests broken by our modifications
  - fixes for murano syntax errors

Implements blueprint: fuel-library-rspec-testing
Partial-bug: #1396510

Change-Id: Id53d8d6f36fdcdf7766e143bbb9b788af299882b
Signed-off-by: Sergii Golovatiuk <sgolovatiuk@mirantis.com>
Merge "Unit tests script for fuel-library"