Update install-p4-tools.sh to use P4Runtime v1.0

Includes also various improvements to the p4vm scripts, such as:
- Choose to build VM with Ubuntu 16.04 or 18.04 (experimental)
- Allow users to specify version of protobuf and grpc to use
- Avoid building protobuf and grpc if already installed in the system
- Install Bazel 0.22

Also:
- Remove check for invalid group member weights (now PI always returns
members with weight 1)
- Re-compiled all P4 programs and fixed missing padding in controller
packet headers

Change-Id: I0e672fcebbaba63354c749f0c774af251f3cbc6c
diff --git a/tools/dev/p4vm/user-bootstrap.sh b/tools/dev/p4vm/user-bootstrap.sh
index 6420998..5620506 100755
--- a/tools/dev/p4vm/user-bootstrap.sh
+++ b/tools/dev/p4vm/user-bootstrap.sh
@@ -19,7 +19,7 @@
 EOF
 
 # Build and install P4 tools
-bash /vagrant/install-p4-tools.sh
+DEBUG_FLAGS=true FAST_BUILD=true bash /vagrant/install-p4-tools.sh
 # We'll delete bmv2 sources later...
 cp ~/p4tools/bmv2/tools/veth_setup.sh ~/veth_setup.sh
 cp ~/p4tools/bmv2/tools/veth_teardown.sh ~/veth_teardown.sh
@@ -53,7 +53,3 @@
 
 # Set Python path for bmv2 in fabric.p4
 echo 'export PYTHONPATH=$PYTHONPATH:$ONOS_ROOT/tools/dev/mininet' >> ~/.bashrc
-
-# FIXME: for some reason protobuf python bindings are not properly installed
-cd ~/p4tools/protobuf/python
-sudo pip install .