Updated git submodules

Project: releng/builder master 1682cc57ffcd4287ddeb0f86da65607eeca41188

Wait for DNS before attempting git clone

Sometimes cloud-init comes online but DNS is not yet available when our
user-data script runs (see error example below). Let's loop infinitely
until git.opendaylight.org is resolvable.

Feb 18 01:45:02 centos-7---devstack-mitaka---20170210-1356 cloud-init:
fatal: unable to access 'https://git.opendaylight.org/gerrit/releng/builder/':
  Could not resolve host: git.opendaylight.org; Unknown error

Trello: https://trello.com/c/grIk0LdG
Change-Id: I038af66b0bce9142f0da7d26b4f26959914ae6b2
Signed-off-by: Thanh Ha <thanh.ha@linuxfoundation.org>

diff --git a/docs/submodules/releng/builder b/docs/submodules/releng/builder
index 20454ba68d0193d3f597786f693886e9037c62f4..1682cc57ffcd4287ddeb0f86da65607eeca41188 160000 (submodule)
--- a/docs/submodules/releng/builder
+++ b/docs/submodules/releng/builder
@@ -1 +1 @@
-Subproject commit 20454ba68d0193d3f597786f693886e9037c62f4
+Subproject commit 1682cc57ffcd4287ddeb0f86da65607eeca41188