[CI] Added path to logs to the test server launcher script at Travis

Author: karmi

.travis.yml

@@ -26,7 +26,7 @@ before_script:
   - rake bundle:install
 
 script:
-  - SERVER=launch TEST_CLUSTER_COMMAND=/usr/share/elasticsearch/bin/elasticsearch TEST_CLUSTER_PARAMS='-Des.default.path.conf=/etc/elasticsearch/' bundle exec rake test:all
+  - SERVER=launch TEST_CLUSTER_COMMAND=/usr/share/elasticsearch/bin/elasticsearch TEST_CLUSTER_PARAMS='-Des.default.path.conf=/etc/elasticsearch/ -Des.default.path.logs==/var/log/elasticsearch/' bundle exec rake test:all
 
 notifications:
   disable: true