option to override workspace name when creating a workspace from a devfile

[sunix]

Each time a developer creates a workpace from the same devfile, if the workspace name already exist, che would suffix it with an underscore char + incremental number.
This PR provides the ability to customize this name in the case user would like to name its workspace differently. For instance name could containsindication about the task/issue or anything else.

Previously, without the option:

chectl workspace:start --devfile=devfile.yaml
  ✔ Retrieving Che Server URL...http://che-che.192.168.39.216.nip.io
  ✔ Verify if Che server is running
  ✔ Create workspace from Devfile devfile.yaml

Workspace IDE URL:
http://che-che.192.168.39.216.nip.io/dashboard/#/ide/che/chectl_3

Now with the option --name=

chectl workspace:start --devfile=devfile.yaml --name=chectl-fix-component-name
  ✔ Retrieving Che Server URL...http://che-che.192.168.39.216.nip.io
  ✔ Verify if Che server is running
  ✔ Create workspace from Devfile devfile.yaml

Workspace IDE URL:
http://che-che.192.168.39.216.nip.io/dashboard/#/ide/che/chectl-fix-component-name

[benoitf]

@sunix please fix the build before merging