Fix bug with using isinstance with ros messages
Fix bug with using isinstance with ros messages

- For instance, the msg class would not be directly ImuBatch, but some
compiled type <class 'tmpB_75GV._imu__ImuBatch'>.
sbrodeur/ros-icreate-bbb,sbrodeur/ros-icreate-bbb,sbrodeur/ros-icreate-bbb,sbrodeur/ros-icreate-bbb