[ci] Install bundles into vendor/bundle, fix bundle config when calling pmdtester

.travis.yml

@@ -52,7 +52,7 @@ before_install:
 install:
   - . ./install-jdk.sh -F 11 -L GPL -W $HOME/jdk
   - gem install bundler
-  - bundle install --with=release_notes_preprocessing
+  - bundle install --with=release_notes_preprocessing --path=vendor/bundle
 before_script: true
 script: source .travis/build-$BUILD.sh
 after_success: true

.travis/build-deploy.sh

@@ -30,7 +30,7 @@ TRAVIS_COMMIT_RANGE=${TRAVIS_COMMIT_RANGE}"
 function upload_baseline() {
     log_info "Generating and uploading baseline for pmdtester..."
     cd ..
-    bundle config --local path pmd/vendor/bundle
+    bundle config --local gemfile pmd/Gemfile
     bundle exec pmdtester -m single -r ./pmd -p ${TRAVIS_BRANCH} -pc ./pmd/.travis/all-java.xml -l ./pmd/.travis/project-list.xml -f
     cd target/reports
     BRANCH_FILENAME="${TRAVIS_BRANCH/\//_}"