Update git submodules

* Update docs/submodules/releng from branch 'master'
  to 73b1b8a65345b8e1fd0c41b603aa1f750be0efea
  - Merge "[fuel] Set vpp virtual master triggers"
  - [fuel] Set vpp virtual master triggers

    Signed-off-by: Cristina Pauna <cristina.pauna@enea.com>
    Change-Id: I8651630d80b8fe38c297cb6f0f9801fbca2bc30a

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 0aad4d4..73b1b8a 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 0aad4d4aaeb6de0f8db12fb6f9a380482de7c39c
+Subproject commit 73b1b8a65345b8e1fd0c41b603aa1f750be0efea