Update travis-utils to v15

travis.sh

@@ -3,13 +3,14 @@
 set -euo pipefail
 
 function installTravisTools {
-  curl -sSL https://raw.githubusercontent.com/sonarsource/travis-utils/v14/install.sh | bash
-  source /tmp/travis-utils/env.sh
+  mkdir ~/.local
+  curl -sSL https://github.com/SonarSource/travis-utils/tarball/v15 | tar zx --strip-components 1 -C ~/.local
+  source ~/.local/bin/install
 }
 
 function prepareIts {
   installTravisTools
-  travis_start_xvfb
+  start_xvfb
 }
 
 case "$JOB" in
@@ -23,7 +24,7 @@ POSTGRES)
 
   psql -c 'create database sonar;' -U postgres
 
-  travis_runDatabaseCI "postgresql" "jdbc:postgresql://localhost/sonar" "postgres" ""
+  runDatabaseCI "postgresql" "jdbc:postgresql://localhost/sonar" "postgres" ""
   ;;
 
 MYSQL)
@@ -34,11 +35,11 @@ MYSQL)
   mysql -e "GRANT ALL ON sonar.* TO 'sonar'@'localhost';" -uroot
   mysql -e "FLUSH PRIVILEGES;" -uroot
 
-  travis_runDatabaseCI "mysql" "jdbc:mysql://localhost/sonar?useUnicode=true&characterEncoding=utf8&rewriteBatchedStatements=true&useConfigs=maxPerformance" "sonar" "sonar"
+  runDatabaseCI "mysql" "jdbc:mysql://localhost/sonar?useUnicode=true&characterEncoding=utf8&rewriteBatchedStatements=true&useConfigs=maxPerformance" "sonar" "sonar"
   ;;
 
 WEB)
-  export DISPLAY=:99.0
+  prepareIts
   /sbin/start-stop-daemon --start --quiet --pidfile /tmp/custom_xvfb_99.pid --make-pidfile --background --exec /usr/bin/Xvfb -- :99 -ac -screen 0 1280x1024x16
   wget http://selenium-release.storage.googleapis.com/2.46/selenium-server-standalone-2.46.0.jar
   nohup java -jar selenium-server-standalone-2.46.0.jar &
@@ -96,8 +97,4 @@ ITS_PLUGINS)
   mvn install -Pit,dev -DskipTests -Dsonar.runtimeVersion=DEV -Dcategory="plugins" -Dmaven.test.redirectTestOutputToFile=false
   ;;
 
-*)
-  echo "Invalid JOB choice [$JOB]"
-  exit 1
-
 esac