changed mavros connection string, updated gazebo sitl build process

integrationtests/run_tests.bash

@@ -43,11 +43,7 @@ ln -s ${SRC_DIR} /root/Firmware
 echo "=====> compile ($SRC_DIR)"
 cd $SRC_DIR
 make ${BUILD}
-mkdir -p Tools/sitl_gazebo/Build
-cd Tools/sitl_gazebo/Build
-cmake -Wno-dev ..
-make -j4
-make sdf
+make --no-print-directory gazebo_build
 echo "<====="
 
 # don't exit on error anymore from here on (because single tests or exports might fail)

integrationtests/setup_gazebo_ros.bash

@@ -18,3 +18,5 @@ export GAZEBO_MODEL_PATH=${GAZEBO_MODEL_PATH}:${SRC_DIR}/Tools/sitl_gazebo/model
 export GAZEBO_PLUGIN_PATH=${SRC_DIR}/Tools/sitl_gazebo/Build/:${GAZEBO_PLUGIN_PATH}
 export LD_LIBRARY_PATH=${LD_LIBRARY_PATH}:${SRC_DIR}/Tools/sitl_gazebo/Build/msgs/
 export ROS_PACKAGE_PATH=${ROS_PACKAGE_PATH}:${SRC_DIR}
+export GAZEBO_MODEL_DATABASE_URI=""
+export SITL_GAZEBO_PATH=$SRC_DIR/Tools/sitl_gazebo