Update git submodules

* Update docs/submodules/snaps from branch 'master'
  - Added 3 new subnet values for ansible substitutions

    Change-Id: Idd39e4f6e3f22fcbafe3aae2512ac36cf9e2a417
    Signed-off-by: spisarski <s.pisarski@cablelabs.com>

diff --git a/docs/submodules/snaps b/docs/submodules/snaps
index 9cf59ae..cf91f88 160000 (submodule)
--- a/docs/submodules/snaps
+++ b/docs/submodules/snaps
@@ -1 +1 @@
-Subproject commit 9cf59ae0a133b0c8ab3907c84ec3c7b962df599a
+Subproject commit cf91f88c2e3fb0fd54a7f33f44e0a8196a8481fb