Update git submodules

* Update docs/submodules/releng from branch 'master'
  - CPERF: Fix cleaning cloned folder

    Change-Id: Ie933308557023877b19e43bbde95470c2bf159ca
    Signed-off-by: Tim Rozet <trozet@redhat.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index dd3eeb1..0a57a06 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit dd3eeb1794d1e80b3cd06206edfe766e498b18c9
+Subproject commit 0a57a06ef50e9f83c6e8495a9c6ccfe888b67d51