Modify Error Message When Trying to Run Che Server Twice

[JamesDrummond]

Should we change the error message when trying to run che server if it is already running.

Reproduction Steps:

1. docker run --rm -t -v /var/run/docker.sock:/var/run/docker.sock eclipse/che start
2. docker run --rm -t -v /var/run/docker.sock:/var/run/docker.sock eclipse/che start

Expected behavior:

Error message stating to run docker run --rm -t -v /var/run/docker.sock:/var/run/docker.sock eclipse/che stop.

Observed behavior:

Error message stating to run docker rm -f che-server.

[Describe observed behavior here]

Che version: nightly-4.7
OS and version: Ubuntu 16.04.1 LTS
Docker version:
Client:
Version: 1.11.2
API version: 1.23
Go version: go1.6.2
Git commit: b9f10c9
Built: Thu, 16 Jun 2016 21:17:51 +1200
OS/Arch: linux/amd64
Che install:
Google Cloud.

Additional information:

• Problem started happening recently, didn't happen in an older version of Che: [Yes/No] No
• Problem can be reliably reproduced, doesn't happen randomly: [Yes/No] Yes

[TylerJewell]

This is expected behavior.

[JamesDrummond]

If the server is shutdown with docker rm -f che-server certain files will not be saved. I know sometimes docker run --rm -t -v /var/run/docker.sock:/var/run/docker.sock eclipse/che stop will not work sometimes if the che server container is not responsive. Would putting both messages make sense. I meant to put both in expected behavior. Might be that I restart che server more then the average user though :).

[TylerJewell]

Good point. I added this to the che-launcher. Should show up in nightly by end of the week. Here is the new output.

ERROR: !!!
ERROR: !!!
           A container running ECLIPSE CHE named "che-server" already exists.
             1. Use "info" to find it's URL.
             2. Use "restart" to stop it and start anew.
             3. Stop it with "stop".
             4. Remove it manually (docker rm -f che-server) and try again. Or:
             5. Set CHE_SERVER_CONTAINER_NAME to a different value and try again.
ERROR: !!!