travis - jdk: openjdk8 and don't re-install docker (#24)

Author: dgrove-oss

.travis.yml

@@ -17,11 +17,11 @@
 
 sudo: required
 dist: xenial
-language: scala
-scala:
-   - 2.12.7
+jdk: openjdk8
+language: java
 services:
 - docker
+
 notifications:
   email: false
   webhooks:

tools/travis/build.sh

@@ -31,11 +31,6 @@ export OPENWHISK_HOME=$WHISKDIR
 cd $UTILDIR
 scancode/scanCode.py --config scancode/ASF-Release.cfg $ROOTDIR
 
-# Upgrade docker version
-curl -fsSL https://get.docker.com -o get-docker.sh
-sudo sh get-docker.sh
-docker version
-
 # Upgrade dpkg avoid problems installing dotnet 3.0
 # https://github.com/travis-ci/travis-ci/issues/9361#issuecomment-408431262
 sudo apt-get install -y --force-yes -q -qq dpkg