[sr_utilities] useless dependencies

[guihomework]

While rebasing some of my code above melodic-devel I noticed you added new dependencies to some packages in sr_utilities but I cannot see them being required.

• https://github.com/shadow-robot/sr_core/blob/melodic-devel/sr_utilities/package.xml#L26
  As far as I understood, the calibration is not using ros_ethercat_model calibrate class anymore (was deleted shadow-robot/ros_ethercat@7edd6ba)

• https://github.com/shadow-robot/sr_core/blob/melodic-devel/sr_utilities/package.xml#L27
  I think those are left-overs of this attempt https://github.com/shadow-robot/sr_core/pull/153/files to add some jacobian to sr_utilities which did not exist in the merged PR F hybrid controller ethan #161

can one clean them up ?