Preparing for Indigo Sync 2018-12-10

Indigo Maintainers,

We have just over 100 packages to sync I’ve identified one regression in a recent release which we’re rolling back https://github.com/ros/rosdistro/pull/19674

Otherwise we look good to sync. Please comment back here if there are any unknown issue otherwise I will plan to hold new indigo releases and sync the packages on Wednesday.

The sync is out: