Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "[fuel] Accept arm clusters as valid deploy targets"
  - [fuel] Accept arm clusters as valid deploy targets

    JIRA: ARMBAND-401

    Change-Id: Icd32874ecb38c3f7469e71bd461794b65f50494c
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index d53c8f0..e59d12c 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit d53c8f03e314462ac1d9e475cc28ca750a2d5b56
+Subproject commit e59d12cec1800def7eac0025a1ba53bf17e4eeee