Update git submodules

* Update docs/submodules/snaps from branch 'master'
  - Merge "Leverage on pbr (Python Build Reasonableness)"
  - Leverage on pbr (Python Build Reasonableness)

    It also updates requirements according to OpenStack stable/ocata
    except for nova client version as snaps needs nova support of
    floating IP which has been removed in pike [1] (8.0.0 [2]).

    It must be reverted to >=6.0.0,!=7.0.0 as soon as snaps calls the
    related neutron commands.

    [1] https://github.com/openstack/python-novaclient/blob/master/releasenotes/notes/pike-rm-deprecated-net-272aeb62b329a5bc.yaml
    [2] https://docs.openstack.org/releasenotes/python-novaclient/unreleased.html

    Change-Id: Iaa0285471da5f2f73cbfef038c9902e1c39fa009
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/snaps b/docs/submodules/snaps
index c11ad93..41770b9 160000 (submodule)
--- a/docs/submodules/snaps
+++ b/docs/submodules/snaps
@@ -1 +1 @@
-Subproject commit c11ad93486a89a29cf90bfeceb0e1da38c419799
+Subproject commit 41770b94bdff067738dbb0f09e1a48b259584b11