Update git submodules

* Update docs/submodules/snaps from branch 'master'
  - Restricted Ansible version to >=2.1 && < 2.4

    ansible_utils.py leverages the class ansible.vars.VariableManager
    which no longer exists in Ansible 2.4.x

    JIRA: SNAPS-187

    Change-Id: I3e92e5addb7251554d6ec9befa61bfcc9e1376ef
    Signed-off-by: spisarski <s.pisarski@cablelabs.com>

diff --git a/docs/submodules/snaps b/docs/submodules/snaps
index 440acd7..cef5b45 160000 (submodule)
--- a/docs/submodules/snaps
+++ b/docs/submodules/snaps
@@ -1 +1 @@
-Subproject commit 440acd77fbda4cf944cc915bef4183935527f651
+Subproject commit cef5b452099579a3f69a5c233b7ba25bd0d80f5c