add status command

mpsd-software-environment.py

@@ -850,6 +850,7 @@ def main():
         ("reinstall", "Reinstall a software environment"),
         ("remove", "Remove a software environment or toolchains from an environment"),
         ("start-new", "Start a new software environment version"),
+        ("status", "Show the status of the software environment"),
     ]
     for cmd, help_text in list_of_cmds:
         subp = subparsers.add_parser(cmd, help=help_text)