Run demo.launch on melodic#101

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708yamaguchi wants to merge 3 commits intoZebraDevs:gazebo9from

708yamaguchi:demo-melodic

Commits on Apr 1, 2020

Run demo.launch on melodic
708yamaguchi
committed

Commits on Apr 14, 2020

use kwarg use_service when calling addSolidPrimitive
708yamaguchi
committed

Commits on Jun 1, 2020

Fix per review
erelson
authored