Update git submodules

* Update docs/submodules/releng/builder from branch 'master'
  to 86c47d5da2d909a96685dcb632447dfba436e005
  - Switch Docker template to common-packer

    Switch to the common-packer Docker template. Split out the merge
    job templates so that we do not need to maintain that epic
    exclusion list.

    Change-Id: Ia2f62e3c8f602d7f3232277864386ae9d53f9889
    Signed-off-by: Thanh Ha <thanh.ha@linuxfoundation.org>

diff --git a/docs/submodules/releng/builder b/docs/submodules/releng/builder
index 0a3c84bce0b23dfa756cf4ebfa275eabc344b1b3..86c47d5da2d909a96685dcb632447dfba436e005 160000 (submodule)
--- a/docs/submodules/releng/builder
+++ b/docs/submodules/releng/builder
@@ -1 +1 @@
-Subproject commit 0a3c84bce0b23dfa756cf4ebfa275eabc344b1b3
+Subproject commit 86c47d5da2d909a96685dcb632447dfba436e005