[Travis] Try to get Solr dependnecy to resolve (#1852)

* [Travis] Try to get Solr dependnecy to resolve

* [Travis] Workaround Java issues on travis

.travis.yml

@@ -4,6 +4,9 @@ sudo: required
 
 language: php
 
+# Workaround for java not started issues: https://github.com/travis-ci/travis-ci/issues/6928
+group: deprecated
+
 services:
   - mysql
   - postgresql

bin/.travis/prepare_unittest.sh

@@ -42,6 +42,9 @@ if [ "$TEST_CONFIG" = "phpunit-integration-legacy-solr.xml" ] ; then
     echo "> Require ezsystems/ezplatform-solr-search-engine:^1.1.0@dev"
     composer require --no-update ezsystems/ezplatform-solr-search-engine:^1.1.0@dev
     COMPOSER_UPDATE="true"
+
+    # Because of either some changes in travis, composer or git, composer is not able to pick version for "self" on inclusion of solr anymore, so we force it:
+    export COMPOSER_ROOT_VERSION=`php -r 'echo json_decode(file_get_contents("./composer.json"), true)["extra"]["branch-alias"]["dev-tmp_ci_branch"];'`
 fi
 
 # Switch to another Symfony version if asked for