Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "adding pike support during installation."
  - adding pike support during installation.

    Change-Id: I31a1f6d1de5796c82bcf7e001451ec3ca0d3b1ce
    Signed-off-by: Narinder Gupta <narinder.gupta@canonical.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 12c1010..c592bdf 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 12c101004c4698a6e475ae062084da41b1c47f1f
+Subproject commit c592bdf51b90bf2ce827b08a3586d97c833ec9f5