Joint Position and Velocity controllers startup fix

[goretkin]

Fixes #374

[goretkin]

Sorry, I meant to merge into groovy-devel. I don't know how to change it. Perhaps I need to close this PR and open a new one.

I also wanted to show that this fix is what is already done in other controllers, for example: https://github.com/PR2/pr2_controllers/blob/hydro-devel/robot_mechanism_controllers/src/joint_trajectory_action_controller.cpp#L313 They also use the starting function to set the last_time_.

[goretkin]

@k-okada Hi, what does the question tag mean? Are you interested in maintaining this package?

[k-okada]

I'm released these package as a part of our Orphaned Maintanair Project. so not so much interested in 'maintaining' this package, sorry for that.

I'm not sure if we should include this PR, so waiting for other users feedback. Also could you please rebase this on kinetic-devel branch?

c.f. PR2/rqt_pr2_dashboard#20 (comment)

[v4hn]

I did not test this on the robot,
but the changes make sense and look good to me.

Merging the commits in groovy or hydro doesn't make sense anymore in my opinion. (unless someone asks for it)
I would propose to re-open this request against kinetic (possibly indigo) and commit it there.

[v4hn]

Replaced by #404 (error code: merge event not found -.-")