Update travis config to run rpc-tests.py in quiet mode

Author: jnewbery

.travis.yml

@@ -70,7 +70,7 @@ script:
     - make $MAKEJOBS $GOAL || ( echo "Build failure. Verbose build follows." && make $GOAL V=1 ; false )
     - export LD_LIBRARY_PATH=$TRAVIS_BUILD_DIR/depends/$HOST/lib
     - if [ "$RUN_TESTS" = "true" ]; then make $MAKEJOBS check VERBOSE=1; fi
-    - if [ "$TRAVIS_EVENT_TYPE" = "cron" ]; then extended="--extended --exclude pruning"; fi
+    - if [ "$TRAVIS_EVENT_TYPE" = "cron" ]; then extended="--extended --quiet --exclude pruning"; fi
     - if [ "$RUN_TESTS" = "true" ]; then test/functional/test_runner.py --coverage ${extended}; fi
 after_script:
     - echo $TRAVIS_COMMIT_RANGE