server:start doesn't work if Che has already been deployed

[benoitf]

From chectl created by l0rd: che-incubator/chectl#77

If Che is already deployed the flow should be different:

a) if Che is deployed and running: returns saying that Che is already running
b) if Che is deployed and stopped: starts Che and return saying that Che was already deployed

There is also #32 that is about these 2 flows but extending them using the flag --if-already-exist flag.

[benoitf]

@l0rd I've already made some changes as well. Thanks for sharing your changes, will take a look and probably reuse some parts.

[benoitf]

@sleshchenko I am perfectly fine if you are work on this issue but I started working on it a few months ago: l0rd/chectl@6682c5c. I wasn't happy with that preliminary work (too complicated) and never actually created a PR. Unassigning it to myself.

[benoitf]

The work is suspended in the flavor of eclipse-che/che-operator#71