Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "Remove VNF catalogue from releng It has been transfered to sample vnf repo [1]"
  - Remove VNF catalogue from releng
    It has been transfered to sample vnf repo [1]

    [1]: https://git.opnfv.org/samplevnf/tree/VNF_Catalogue

    Change-Id: I418151bd24517efeb66fc0ae76cb9e091bd130f6
    Signed-off-by: Morgan Richomme <morgan.richomme@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 3d34691..8975628 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 3d34691287f0efd7361cc35f9a7cbe4e27f0b5f6
+Subproject commit 897562894530a0227e78cf546f629809437925e0