Bug 529390 - Run in Container launch config not resetting err message

- modify ContainerTab to reset the error message when Docker
  Connections/Image changes cause a listener notification and
  then look to see if no connections or no images errors exist
- modify ContainerTab to reset the error message if the Docker
  Connection selected gets changed
- bump org.eclipse.cdt.docker.launcher version to 1.1.1

Change-Id: Iad5051750a5dd53a0eb458d73570fffd9e3867c4
2 files changed