Add .gitmodule entry for vvp

Update sphinx conf.py to show master branch

Change-Id: Ib62ff4699b179c6acaf3fe2ffb11372d9b56bc85
Issue-ID: DOC-58
Signed-off-by: Rich Bennett <rb2745@att.com>
diff --git a/.gitmodules b/.gitmodules
index d26fcaf..5ea3cb1 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -263,3 +263,8 @@
 	url = ../modeling/toscaparsers
 	branch = .
 	ignore = dirty
+[submodule "docs/submodules/vvp/documentation.git"]
+	path = docs/submodules/vvp/documentation.git
+	url = ../vvp/documentation
+	branch = .
+	ignore = dirty