Allow reusing existing instance of ignition physics

[osrf-migration]

Original report (archived issue) by Shane Loretz (Bitbucket: Shane Loretz, GitHub: sloretz).

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Initializers in https://osrfoundation.atlassian.net/wiki/spaces/GAZ/pages/11599873/Ignition+Sensors

Related https://osrf-migration.github.io/ignition-gh-pages/#!/ignitionrobotics/ign-sensors/pull-requests/1/wip-manager-interface/activity#comment-42770711

      /// \brief Initialize the sensor library with physics.
      /// \return True if successfully initialized, false if not
      bool Init(ignition::physics::Manager &_physics);

      /// \brief Initialize the sensor library with rendering and physics.
      /// \return True if successfully initialized, false if not
      bool Init(ignition::rendering::Manager &_rendering, ignition::physics::Manager &_physics);

/// \brief set the rendering manager used by sensors
SetPhysics(ignition::physics::Manager &_physics)

[osrf-migration]

Original comment by Shane Loretz (Bitbucket: Shane Loretz, GitHub: sloretz).

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• Edited issue description* changed title from "Allow reusing existing instances of ignition physics and rendering" to "Allow reusing existing instance of ignition physics"

Just physics in this issue, not rendering

[osrf-migration]

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

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• changed state from "new" to "resolved"

Fix issue #1

→ \<\<cset f3141a43917c756c6c1766fdb744c2df90d7bc58>>