[6683] Removing unnecessary files and update gitignore

VOL-507, VOL-463: Protobuf upgrade to 3.3 and Chameleon Removal

Update the Protobuf version from 3.1 to 3.3 to alleviate
a protobuf issue when loading protobuf extensions.  The following
tests have been performed:
- Create a local Vagrant VM
- Voltha ensemble startup and check for errors/exceptions
- Manual compilations of the protos in voltha, ofagent, netconf and
chameleon directory
- Manual tests with ONOS/Voltha/Ponsim using Netconf, Curl and CLI
- Run the integration tests (known issues have Jiras already raised
against them.
- Run the make jenkins-test and make utest-with-coverage

Chameleon has been removed entirely from Voltha projects. Basic tests
have run to verify chameleon dependency has been removed.  Some
documents (like README) will need to be changed under a separate Jiras
as they are referenced in different adapters.  Some integration tests
will also need to be updated as well.

Change-Id: I2b266719a6825fb07ece3a79f7f81881ab3b9761
diff --git a/envoy/Makefile b/envoy/Makefile
index b19707c..91df9e3 100644
--- a/envoy/Makefile
+++ b/envoy/Makefile
@@ -31,7 +31,7 @@
 
 PROTOC := $(PROTOC_PREFIX)/bin/protoc
 
-PROTOC_VERSION := "3.0.2"
+PROTOC_VERSION := "3.3.0"
 PROTOC_DOWNLOAD_PREFIX := "https://github.com/google/protobuf/releases/download"
 PROTOC_DIR := protobuf-$(PROTOC_VERSION)
 PROTOC_TARBALL := protobuf-python-$(PROTOC_VERSION).tar.gz