Various improvements to p4vm scripts

- Allow running up to a given step of install-p4-tools.sh
(e.g. helpful to install only PI)
- Install fabric-p4test deps (ONOS-7656)
- Fix python protobuf libraries not installed

Change-Id: I443edb08f455703ae682e485a89d793a584c30ff
diff --git a/tools/dev/bin/onos-setup-p4-dev b/tools/dev/bin/onos-setup-p4-dev
index f0e94c9..4ec48f3 100755
--- a/tools/dev/bin/onos-setup-p4-dev
+++ b/tools/dev/bin/onos-setup-p4-dev
@@ -2,4 +2,4 @@
 
 DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
 
-bash ${DIR}/../p4vm/install-p4-tools.sh
+bash ${DIR}/../p4vm/install-p4-tools.sh "$@"