*Describe the bug*
The drain.sh in amq-launch-module should wait for the broker (which is running background) to finish
before exit. This is useful for broker to shutdown properly and for checking out broker status when scale
down fails.

*To Reproduce*
Steps to reproduce the behavior:
1. Get X version of the source
2. '...'

*Platform (please complete the following information):*

• OS: [e.g. Fedora]
• Version [e.g. 32]
• CEKit version [e.g. 3.5.0]
• Container build tool [e.g. podman]

*Expected behavior*
Optional, use if not obvious. A clear and concise description of what you expected to happen.

*Screenshots*
Optional, add screenshots to help explain your problem.

*Additional context*
Optional. Add any other context about the problem here.