Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "Disable vnf runs for aarch64"
  - Disable vnf runs for aarch64

    Functest VNF tests are not adapted for aarch64.
    The tests can be reactivated when they are adapted to execute
    on aarch64.
    JIRA: FUNCTEST-964

    Change-Id: I2413a6eff831c8dd2751b7bc73ad583f55a00dcf
    Signed-off-by: Delia Popescu <delia.popescu@enea.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index ef5e612..ec9ee45 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit ef5e612469b7d4a03ad0ac9ffede40e8203a4f27
+Subproject commit ec9ee453c5a62e98003b8059754e578d085e1c96