Update git submodules

* Update ceilometer from branch 'master'
  to 0b3939b3b6d26aa2fd49d036ef6eb69cd26718f6
  - Add unit tests for ceilometer.keystone_client

    There is no direct testing for this file.

    Assisted-by: Claude
    Change-Id: I0706167c8835ba38337686f4dae07cd7e9e52e22
    Signed-off-by: "efoley <efoley@redhat.com>"

diff --git a/ceilometer b/ceilometer
index 942220b7d78f392e0db08dd134df6bde64c0bcf8..0b3939b3b6d26aa2fd49d036ef6eb69cd26718f6 160000 (submodule)
--- a/ceilometer
+++ b/ceilometer
@@ -1 +1 @@
-Subproject commit 942220b7d78f392e0db08dd134df6bde64c0bcf8
+Subproject commit 0b3939b3b6d26aa2fd49d036ef6eb69cd26718f6