Node should stay alive even if realsense disconnects

[jonlwowski012]

Node should stay alive even if realsense disconnects. The node will continually look for a new realsense if the current realsense disconnects.

The pull request depends on https://github.com/plusone-robotics/realsense/pull/16/

The original MR for this is here https://github.com/plusone-robotics/realsense/pull/17

Review items

• [x] Blocked by https://github.com/plusone-robotics/realsense/pull/19 -> Not needed https://github.com/plusone-robotics/realsense/pull/17#issuecomment-464346965
• [x] Verify w/hardware
• [x] Rebase to the origin to remove #16 from the change in this PR.
• [x] CI passes.
  • Due to flaky tests (kindf of reported at the upstream https://github.com/intel-ros/realsense/issues/619#issuecomment-464238122 although that's not the right approach to fix an issue), test section likely fails but Travis CI will unlikely report it as a failure.

[jonlwowski012]

@130s Can this be merged yet?

[130s]

• [x] Verify w/hardware

Just confirming; is this still valid (i.e. is the updated change tested)?

[jonlwowski012]

• [x] Verify w/hardware

Just confirming; is this still valid (i.e. is the updated change tested)?

Yes I re-tested this by running the realsense and then unplugging and replugging it back it and confirming that the camera automatically reconnected without the driver dying

[130s]

Closed in favor of https://github.com/plusone-robotics/realsense/pull/21