Minimal virtualenv for swagger docs

Change-Id: I63815145fc4049373854f32388558912fe4382e3
diff --git a/docs/.gitignore b/docs/.gitignore
index 8bec8ec..d1adcde 100644
--- a/docs/.gitignore
+++ b/docs/.gitignore
@@ -1 +1,2 @@
-_book/
\ No newline at end of file
+_book/
+venv-xosdocs