WIP: build with JDK11 and Docker on CircleCI

* Upgrade docker-maven-plugin from 0.4.13 to 1.2.0
  * latest version supports Java 11
* Upgrade ssh-agent-tls from 0.0.3 to 0.0.4
* Upgrade ssh-agent-proxy from 0.1.5 to 0.2.0

.circleci/config.yml

@@ -12,6 +12,7 @@ jobs:
     environment:
       CIRCLE_ARTIFACTS: /tmp/circleci-artifacts
       CIRCLE_TEST_REPORTS: /tmp/circleci-test-results
+      CIRCLE_MACHINE_EXECUTOR: true
       MAVEN_OPTS: -Xmx128m
       JAVA_VERSION: *jdk_180_version
 
@@ -66,14 +67,20 @@ jobs:
     docker:
       - image: spotify/helios-test-container:1
     working_directory: ~/spotify/helios
-    parallelism: 1
+    parallelism: 6
     shell: /bin/bash --login
     environment:
+      CIRCLE_ARTIFACTS: /tmp/circleci-artifacts
+      CIRCLE_TEST_REPORTS: /tmp/circleci-test-results
       MAVEN_OPTS: -Xmx128m
 
     steps:
     - checkout
 
+    - setup_remote_docker
+
+    - run: mkdir -p $CIRCLE_ARTIFACTS $CIRCLE_TEST_REPORTS
+
     - run: ./circle.sh pre_machine
 
     - run:
@@ -83,7 +90,26 @@ jobs:
         # Without this increased timeout, downloading deps often times out.
         no_output_timeout: 20m
 
-    - run: ./circle.sh verify_no_tests
+    - run:
+        command: ./circle.sh test
+        no_output_timeout: 20m
+
+    - run: if [ "$CIRCLE_NODE_INDEX" == "0" ]; then ./circle.sh post_test; fi
+
+    - run: ./circle.sh collect_test_reports
+
+    - store_test_results:
+        path: /tmp/circleci-test-results
+
+    # Save artifacts
+    - store_artifacts:
+        path: /tmp/circleci-artifacts
+    - store_artifacts:
+        path: artifacts
+    - store_artifacts:
+        path: /var/log/upstart/docker.log
+    - store_artifacts:
+        path: /tmp/circleci-test-results
 
 workflows:
   version: 2

circle.sh

@@ -33,10 +33,12 @@ case "$1" in
     ;;
 
   test)
-    # fix DOCKER_HOST to be accessible from within containers
-    docker0_ip=$(/sbin/ifconfig docker0 | grep 'inet addr' | \
-      awk -F: '{print $2}' | awk '{print $1}')
-    export DOCKER_HOST="tcp://$docker0_ip:2375"
+    if [ -n "$CIRCLE_MACHINE_EXECUTOR" ]; then
+        # fix DOCKER_HOST to be accessible from within containers
+        docker0_ip=$(/sbin/ifconfig docker0 | grep 'inet addr' | \
+          awk -F: '{print $2}' | awk '{print $1}')
+        export DOCKER_HOST="tcp://$docker0_ip:2375"
+    fi
 
     case $CIRCLE_NODE_INDEX in
       0)