Travis CI update to Ubuntu 18.04 (#3497)

Updated Travic CI to use Ubuntu Bionic 18.04

.travis.yml

@@ -1,50 +1,41 @@
-group: edge
+---
 
-sudo: required
+group: edge
 
-dist: trusty
+dist: bionic
 
 language: java
 
+os: linux
+
 jdk:
   - oraclejdk11
 
 addons:
   apt:
-    sources:
-      - ubuntu-toolchain-r-test
-
     packages:
-      - gcc-4.8
-      - g++-4.8
-      - gcc-4.8-multilib
-      - g++-4.8-multilib
-      - python2.7
+      - libtool-bin
+      - python-dev
+      - python-wheel
       - wget
-      - pkg-config
       - zip
       - zlib1g-dev
       - google-perftools
       - libgoogle-perftools-dev
 
 env:
-  - BAZEL_VERSION=0.26.0 CC=gcc-4.8 CXX=g++-4.8 CPP=cpp-4.8 CXXCPP=cpp-4.8 ENABLE_HEAPCHECK=1
+  - BAZEL_VERSION=0.26.0 ENABLE_HEAPCHECK=1
 
 before_install:
   # download and install bazel
   - wget -q "https://github.com/bazelbuild/bazel/releases/download/${BAZEL_VERSION}/bazel-${BAZEL_VERSION}-installer-linux-x86_64.sh"
   - chmod +x bazel-${BAZEL_VERSION}-installer-linux-x86_64.sh
   - ./bazel-${BAZEL_VERSION}-installer-linux-x86_64.sh --user
 
-before_script:
-  # install python module for wheel files
-  # required for python packaging
-  - sudo pip install wheel
-
 script:
-  - which gcc-4.8
+  - which gcc
   - gcc --version
-  - which g++-4.8
+  - which g++
   - g++ --version
   - which python
   - python -V

integration_test/src/python/local_test_runner/test_template.py

@@ -27,6 +27,7 @@
 import os
 import time
 from urllib.request import urlopen
+import shutil
 import signal
 import subprocess
 from collections import namedtuple
@@ -152,7 +153,7 @@ def _inject_test_data(self):
     # move to read file. This guarantees contents will be put into the file the
     # spout is reading from atomically
     # which increases the determinism
-    os.rename('temp.txt', self.params['readFile'])
+    shutil.move('temp.txt', self.params['readFile'])
 
   def _check_results(self):
     """ get actual and expected result.