Remove protoc install from travis

Protoc is now managed by maven plugin.

Change-Id: I9e8d7e51ff6fdd105502d3e1881dd8b86006d8ab

.travis.yml

@@ -2,20 +2,6 @@ language: java
 before_install:
   - sudo apt-get update -qq
   - sudo apt-get install build-essential
-  - mkdir protobuf_install
-  - pushd protobuf_install
-  - wget https://github.com/google/protobuf/archive/v3.2.0.tar.gz -O protobuf-3.2.0.tar.gz
-  - tar xzf protobuf-3.2.0.tar.gz
-  - cd protobuf-3.2.0
-  - sudo apt-get install autoconf automake libtool curl make g++ unzip
-  - ./autogen.sh
-  - ./configure
-  - make
-  - make check
-  - sudo make install
-  - sudo ldconfig
-  - protoc --version
-  - popd
   - pwd
   - sudo apt-get install -qq libboost-dev libboost-test-dev libboost-program-options-dev libevent-dev automake libtool flex bison pkg-config g++ libssl-dev
   - wget -nv http://archive.apache.org/dist/thrift/0.7.0/thrift-0.7.0.tar.gz