Update git submodules

Update git submodules

* Update watcher from branch 'master'
  to 64993ae6ad9e3191a33241bcfe9d2f4109ccd0e2
  - update unit tests for nova_helper module

    This patch is implementing some improvements in the tests for the
    nova_helper:

    - Replaces mocks by novaclient real objects for faking servers and
      hypervisors.
    - Removes all usage of getattr and setattr.
    - Removes usage of some helpers which were only used once.
    - Removes some mocks for time.sleep in tests given that we have one in
      the setup function of the class.
    - Improves fake_nova_find_list so that it can return lists with more
      that one element if needed.
    - Add some asserts to validate calls to migrate, live_migrate and resize
      methods.

    Note that the test cases and scenarios remains the same.

    Change-Id: Ie2bd4d2fa85b78d799ce51a48c43705f04a28fe7
    Signed-off-by: Alfredo Moralejo <amoralej@redhat.com>