Updated voltha-protos in vendor to the latest version

Added python/pyvoltha and python/voltha-protos to .gitignore
They are copied in as part of the local build process

Updated the quickstart document to install pyvoltha before the cli.

Change-Id: I3928b77ae2af58a6d1416a9412387d432d53dd69
diff --git a/.gitignore b/.gitignore
index 3e4648f..2306a46 100644
--- a/.gitignore
+++ b/.gitignore
@@ -59,6 +59,9 @@
 # voltha cli history
 python/cli/.voltha_cli_history
 
+python/pyvoltha
+python/voltha-protos
+
 # ignore uneeded items in vendor folders
 vendor/github.com/opencord/voltha-protos/protos
 vendor/github.com/opencord/voltha-protos/python