[SQLLINE-172] Travis CI fails for Oracle JDK 10

Simplest solution seems to be to use docker images that contain the
required JDK. The fix includes code from Apache Calcite's .travis.yml.

.travis.yml

@@ -1,16 +1,34 @@
 # Configuration for Travis CI
 language: java
-jdk:
-  - oraclejdk11
-  - oraclejdk10
-  - oraclejdk9
-  - oraclejdk8
+matrix:
+  fast_finish: true
+  include:
+  - env: IMAGE=maven:3-jdk-11 JDOC=Y
+  - env: IMAGE=maven:3-jdk-10
+  - env: IMAGE=maven:3-jdk-9
+  - env: IMAGE=maven:3-jdk-8 JDOC=Y
 branches:
   only:
     - master
+env:
+  global:
+  - DOCKERRUN="docker run -it --rm -v $PWD:/src -v $HOME/.m2:/root/.m2 -w /src"
+services:
+- docker
+before_install:
+- docker pull $IMAGE
+install:
+# Print the Maven version, skip tests and javadoc
+- $DOCKERRUN $IMAGE mvn install -DskipTests=true -Dmaven.javadoc.skip=true -Djavax.net.ssl.trustStorePassword=changeit -B -V
+script:
+# Print surefire output to the console instead of files
+- unset _JAVA_OPTIONS
+- if [ $JDOC = "Y" ]; then export JDOC=javadoc:javadoc; fi
+- $DOCKERRUN $IMAGE mvn -Dcheckstyle.skip -Dsurefire.useFile=false -Dsurefire.threadCount=1 -Dsurefire.perCoreThreadCount=false -Djavax.net.ssl.trustStorePassword=changeit test $JDOC
+git:
+  depth: 10000
+sudo: required
 cache:
   directories:
-    - $HOME/.m2
-git:
-  depth: 1000
+  - $HOME/.m2
 # End .travis.yml