--list option displays available seedprograms to aid with erase-install

installinstallmacos.py

@@ -691,6 +691,9 @@ def main():
     # Output a plist of available updates and quit if list option chosen
     if args.list:
         plistlib.writePlist(pl, output_plist)
+        print ('\n'
+               'Valid seeding programs are: %s'
+               % ', '.join(get_seeding_programs()))
         exit(0)
 
     # check for validity of specified build if argument supplied