Update git submodules

* Update docs/submodules/snaps from branch 'master'
  - Merge "Changed validation logic to check for DHCP lease before SSH connection."
  - Changed validation logic to check for DHCP lease before SSH connection.

    Change-Id: Ifa5c481963d0a9607107465915eb7ab12501e21d
    Signed-off-by: spisarski <s.pisarski@cablelabs.com>

diff --git a/docs/submodules/snaps b/docs/submodules/snaps
index e9aefb6..4ad9342 160000 (submodule)
--- a/docs/submodules/snaps
+++ b/docs/submodules/snaps
@@ -1 +1 @@
-Subproject commit e9aefb62e3e2942084b3845c08d3b0362271b852
+Subproject commit 4ad9342789eb54b91147533691e99270ccd9cca1