[NRRPLT-7590] Python 3 compatibility

[NRRPLT-7717] Applied stage1 and stage2 of futurize and tested verify.sh and run_tests.sh.

[NRRPLT-7590] Upgrade setup.py

[NRRPLT-7590] add setup_requirements.txt and fix Makefile

[NRRPLT-7590] remove future str

[NRRPLT-7590] fix pip version specifier in Makefile

[NRRPLT-7590] update test_fixtures version

[NRRPLT-7590] fix prints

[NRRPLT-7590] merge development

[NRRPLT-7590] quote pip version

[NRRPLT-7590] Force check for pip version in pipeline.
Build GazeboRosPackages in pipeline, since there might be some new ROS dependency.