Update git submodules

* Update docs/submodules/snaps from branch 'master'
  - Enable get_project_by_id when only tenant_id is provided

    This is to improve:
    https://gerrit.opnfv.org/gerrit/#/c/52675/

    Change-Id: I7228e5eadcc121fe94a869c6cbbeac412d972868
    Signed-off-by: Linda Wang <wangwulin@huawei.com>

diff --git a/docs/submodules/snaps b/docs/submodules/snaps
index 65aca3d..390d31e 160000 (submodule)
--- a/docs/submodules/snaps
+++ b/docs/submodules/snaps
@@ -1 +1 @@
-Subproject commit 65aca3d6919a3d31fa360afa01baee5ebff1fe22
+Subproject commit 390d31e3a6eaa0968474d19d71ec804d0c6c071a