Adding check to make sure automatic interface selection only uses interfaces that are up.

#3009 Merged at 47b4380
Repository
jbohren-hbr
Branch
gazebo9
Repository
osrf
Branch
gazebo9
Author
  1. Jonathan Bohren
Reviewers
Description

Without this, the first interface selected might not be active, and it leads to a silent failure and a black render window in gzclient. It appears to occur commonly when running Gazebo under the Windows Subsystem for Linux.

For more info, see this WSL issue: https://github.com/Microsoft/WSL/issues/3368

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