Update git submodules

* Update docs/submodules/snaps from branch 'master'
  - openstack: nova_utils_tests: Increase timeout for API calls

    Patch I2245adb84d0e6d4e3350d17d0c2e44baf5202d51 increased the timeout
    for the API calls to 2 minutes which was then somewhat reverted in
    Iea3aeab59c378917fbd175d673113e8d30e2e4b9. However, the problem still
    persists on slow systems and 30 seconds may not be enough to confirm
    a volume attachment to the VM.

    Change-Id: I860b2a797917e13772e95c5d756919e9792b63a6
    Signed-off-by: Markos Chandras <mchandras@suse.de>

diff --git a/docs/submodules/snaps b/docs/submodules/snaps
index 2090207..91b3bcb 160000 (submodule)
--- a/docs/submodules/snaps
+++ b/docs/submodules/snaps
@@ -1 +1 @@
-Subproject commit 20902078a98bfb76c12919b92cd0345dd3c06f8c
+Subproject commit 91b3bcb7ad2dda9479d2f97b080d8665d83968dd