prevent mismatch issues between mc_rtc timestep and hrpsys timestep

[rohanpsingh]

Cf. https://github.com/isri-aist/hrp5p-iob/issues/87

@gergondet please check commit: https://github.com/jrl-umi3218/mc_openrtm/pull/27/commits/a65ad4a238dc87bb2af768726b4d6bc2713c097e Currently I'm not doing anything if open_iob has failed.

[rohanpsingh]

@gergondet thanks!

I checked on the real robot, and it works as expected:

• If mc-rtc timestep is 0.002 and IOB is on master branch, there's no error thrown
• If mc-rtc timestep is 0.002 and IOB is on 5ms branch, MCControl throws the error about timestep mismatch and we get a [onDeactivated] upon clicking Start mc-control in Choreonoid.

By the way, this can also be checked locally by using the alloc_iob command.