rosbag: adding run-time dependencies

When importing the rosbag python module, it requires these python modules.

recipes-ros/ros-comm/rosbag_1.9.41.bb

@@ -8,6 +8,8 @@ LIC_FILES_CHKSUM = "file://package.xml;beginline=10;endline=10;md5=d566ef916e9de
 DEPENDS = "boost bzip2 cpp-common python-imaging \
   rosconsole roscpp roscpp-serialization topic-tools \
   xmlrpcpp"
+RDEPENDS_${PN} = "python-compression python-threading python-pyyaml python-io \
+  genmsg genpy roslib rospy"
 
 require ros-comm.inc