[VOL-2876]

Documentation cleanup and more compliant swagger docs
Use newer voltha-docker-tools version
Update to python3 venv and Sphinx to build docs

Change-Id: I3fca61aef78e77a893419200502a8fae91135a4a
diff --git a/docs/Makefile b/docs/Makefile
index 13176dc..a2df413 100644
--- a/docs/Makefile
+++ b/docs/Makefile
@@ -17,9 +17,8 @@
 	$(SPHINXBUILD) -M help "$(SOURCEDIR)" "$(BUILDDIR)" $(SPHINXOPTS) $(O)
 
 doc_venv:
-	virtualenv $@ ;\
+	virtualenv -p python3 $@ ;\
 	source $@/bin/activate ;\
-	pip install livereload ;\
 	pip install -r requirements.txt
 
 lint: doc8