Update git submodules

* Update devstack from branch 'master'
  to a05d26ebc4ca81ccf1810c9c203143db552c28cb
  - Merge "Fix ownership of keyring file"
  - Fix ownership of keyring file

    The file should be owned by the user(STACK_USER) to run the process.
    Note that STACK_USER may not match the current user in case stack.sh is
    run by root.

    Also we should not assume that the group name always matches the user
    name.

    Change-Id: Iec300311cab1b1a2fa124879aa3dc6a57a6a706b
    Signed-off-by: Takashi Kajinami <kajinamit@oss.nttdata.com>

diff --git a/devstack b/devstack
index feb248232842f5f299a34f433a7603cffecf3e08..a05d26ebc4ca81ccf1810c9c203143db552c28cb 160000 (submodule)
--- a/devstack
+++ b/devstack
@@ -1 +1 @@
-Subproject commit feb248232842f5f299a34f433a7603cffecf3e08
+Subproject commit a05d26ebc4ca81ccf1810c9c203143db552c28cb