Add .travis.yml to run tests against ActiveMQ Artemis broker in docker

In addition, line coverage is measured and submitted to codecov.io.

.travis.yml

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+sudo: false
+language: java
+jdk:
+  - openjdk8
+  - oraclejdk9
+
+services:
+  - docker
+
+script:
+  # https://docs.travis-ci.com/user/docker/
+  - docker pull jdanekrh/docker-alpine-openjdk-artemis-snapshot
+  - docker run --rm -v`pwd`/scripts:/mnt -p 5672:5672 -p 61616:61616 -p 5673:5673 -p 61617:61617 --entrypoint bash jdanekrh/docker-alpine-openjdk-artemis-snapshot /mnt/entrypoint.sh amq7-server &
+  - sleep 10
+  - mvn clean test jacoco:report
+
+after_success:
+  - bash <(curl -s https://codecov.io/bash)

scripts/entrypoint.sh

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+#!/bin/sh
+set -e
+
+WORKDIR=$(pwd)
+
+ENV_AMQ7_USER=${AMQ7_USER:-admin}
+ENV_AMQ7_PASSWORD=${AMQ7_PASSWORD:-topsecret007}
+ENV_AMQ7_ROLE=${AMQ7_ROLE:-amq}
+ENV_AMQ7_CLUSTER_USER=${AMQ7_ROLE:-amq7Cluster}
+ENV_AMQ7_CLUSTER_PASSWORD=${AMQ7_ROLE:-topsecret007-cluster}
+
+if [ ! "$(ls -A /var/lib/amq7/etc)" ]; then
+	# Create broker instance
+	cd /var/lib
+        /opt/A-MQ7/bin/artemis create amq7 \
+            --home /opt/A-MQ7 \
+            --user $ENV_AMQ7_USER \
+            --password $ENV_AMQ7_PASSWORD \
+            --role $ENV_AMQ7_ROLE \
+            --allow-anonymous \
+            --cluster-user $ENV_AMQ7_CLUSTER_USER \
+            --cluster-password $ENV_AMQ7_CLUSTER_PASSWORD \
+            --http-host 0.0.0.0
+
+        chown -R amq7:amq7 /var/lib/amq7
+	cd $WORKDIR
+fi
+
+# Log to tty to enable docker logs container-name
+sed -ie "s/logger.handlers=.*/logger.handlers=CONSOLE/g" ../etc/logging.properties
+
+# Update min memory if the argument is passed
+if [[ "$ARTEMIS_MIN_MEMORY" ]]; then
+  sed -ie "s/-Xms512M/-Xms$ARTEMIS_MIN_MEMORY/g" ../etc/artemis.profile
+fi
+
+# Update max memory if the argument is passed
+if [[ "$ARTEMIS_MAX_MEMORY" ]]; then
+  sed -ie "s/-Xmx1024M/-Xmx$ARTEMIS_MAX_MEMORY/g" ../etc/artemis.profile
+fi
+
+if [ "$1" = 'amq7-server' ]; then
+	exec su amq7 -c "./artemis run"
+fi
+
+exec "$@"