Update git submodules

* Update docs/submodules/releng from branch 'master'
  to 26fd48d4c446b4fae90dfa20ed675b8441748aab
  - Fix incorrect parent image

    Change-Id: I418e3c13c88c11e930c07c936d3e34cadfc5fb35
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index fbe3476..26fd48d 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit fbe3476573a6662864d2e3e8f3c97087e899a816
+Subproject commit 26fd48d4c446b4fae90dfa20ed675b8441748aab