Pass "-parallel=3" to reduce load on Travis nodes while testing

.travis.yml

@@ -73,7 +73,7 @@ script:
     - if [ $SECONDS -gt 1200 ]; then export DEPENDS_TIMEOUT="true"; false; fi # The "false" here ensures that the build is marked as failed even though the whole script returns 0
     - test "$DEPENDS_TIMEOUT" != "true" && $DOCKER_RUN_IN_BUILDER ./ci/build_src.sh
     - test "$DEPENDS_TIMEOUT" != "true" && $DOCKER_RUN_IN_BUILDER ./ci/test_unittests.sh
-    - test "$DEPENDS_TIMEOUT" != "true" && $DOCKER_RUN_IN_BUILDER ./ci/test_integrationtests.sh
+    - test "$DEPENDS_TIMEOUT" != "true" && $DOCKER_RUN_IN_BUILDER ./ci/test_integrationtests.sh -parallel=3
     - test "$DEPENDS_TIMEOUT" != "true" && if [ "$DOCKER_BUILD" = "true" ]; then BUILD_DIR=build-ci/dashcore-$BUILD_TARGET ./docker/build-docker.sh; fi
 after_script:
     - echo $TRAVIS_COMMIT_RANGE

ci/test_integrationtests.sh

@@ -4,6 +4,8 @@
 
 set -e
 
+PASS_ARGS="$@"
+
 source ./ci/matrix.sh
 
 if [ "$RUN_TESTS" != "true" ]; then
@@ -15,4 +17,4 @@ export LD_LIBRARY_PATH=$BUILD_DIR/depends/$HOST/lib
 
 cd build-ci/dashcore-$BUILD_TARGET
 
-./qa/pull-tester/rpc-tests.py --coverage
+./qa/pull-tester/rpc-tests.py --coverage $PASS_ARGS