new_variant: scripts detect and warn when standalone

Have the various scripts detect that they are running standalone and
offer the user information about using instead.

TEST=`./ volteer volteer gnastygnorc`
and you get a nice warning message about how you could be using instead.

Change-Id: Ib0908c883338be89f86357a4ea984de1893d0eaa
Tested-by: Paul Fagerburg <>
Reviewed-by: Jack Rosenthal <>
Commit-Queue: Paul Fagerburg <>
7 files changed