[3rdparty] Bump openstack to 3.0.6

Signed-off-by: Roeland Jago Douma <roeland@famdouma.nl>

diff --git a/3rdparty b/3rdparty
index e32b936c27940c8b37214f8c62be3ce4c246f6ce..bbef51b59e027569b9eebf0805342fcb2568848e 160000 (submodule)
--- a/3rdparty
+++ b/3rdparty
@@ -1 +1 @@
-Subproject commit e32b936c27940c8b37214f8c62be3ce4c246f6ce
+Subproject commit bbef51b59e027569b9eebf0805342fcb2568848e