Update git submodules

* Update nova from branch 'master'
  - Merge "Fix mock specs set to strings"
  - Fix mock specs set to strings
    
    The behavior of Mock(spec=foo) or Mock(spec_set=foo) when foo is not a
    list is to interpret foo as a class or instance and derive the set of
    attributes you're allowed to get (spec) and/or set (spec_set) based on
    dir(foo) [1]. Thus if foo is a string, your mock will be set up to look
    like a string (with attributes like index, find, startswith...).
    
    So for example, if you see:
    
        Mock(spec='nova.objects.Instance')
    
    ...what was almost certainly intended was:
    
        Mock(spec=nova.objects.Instance)
    
    This commit fixes all such cases in the nova codebase, making those
    specs point to the actual classes as intended.
    
    A subsequent commit will introduce a hacking rule to ensure this mistake
    isn't repeated in the future.
    
    [1] https://docs.python.org/3/library/unittest.mock.html#the-mock-class
    
    Change-Id: I924edd474a798aa32bb8fb88ba6d84815a8bf93e

nova

@@ -1 +1 @@
-Subproject commit 1588b2a1074d4bd83fa966fe3a0c518296bf6102
+Subproject commit 2e5d0eda841430fb697df04f4cbd020819e1bc87