Display which physics engine is being used by gazebo

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Original report (archived issue) by Jose Luis Rivero (Bitbucket: Jose Luis Rivero, GitHub: j-rivero).

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Sometimes is hard to know which physics engine is being used by gazebo, specially sensible to the effect described in issue #1120, which by a lack of support or a type, someone could end up thinking that is used a physics engine but really fall into default as consequence of an error.

It would help if gzclient could display somehow which physics engine is in use.

It could also be a good idea to display it through the command line via gz tool.

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Original comment by Louise Poubel (Bitbucket: chapulina, GitHub: chapulina).

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Issue #1853 was marked as a duplicate of this issue.

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Original comment by Steve Peters (Bitbucket: Steven Peters, GitHub: scpeters).

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pull request #2120

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Original comment by Jose Luis Rivero (Bitbucket: Jose Luis Rivero, GitHub: j-rivero).

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• changed state from "new" to "resolved"

amazing, thanks @mohamed_ayman !

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Original comment by Nate Koenig (Bitbucket: Nathan Koenig).

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• set version to "all"

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Original comment by Nate Koenig (Bitbucket: Nathan Koenig).

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• changed state from "resolved" to "closed"