maas-test is incompatible with the most recent MAAS packages (revision 2182 and up).

Since revision 2182, MAAS doesn't have a maas-import-ephemerals script (all the boot image import is done in one script: maas-import-pxe-files). maas-test explicitly runs the script maas-import-ephemerals and thus needs to be changed to only run import-pxe-files when it deals with a recent MAAS package.

Note that the reason why maas-test runs both maas-import-pxe-files and maas-import-ephemerals (instead of letting maas-import-pxe-files call the other script) is to let the user pass the --simplestreams-filter parameter which is then passed to maas-import-ephemerals. With recent version of MAAS, I suggest we had a new parameter to maas-test (--bootimages_config) to let the user optionally pass a custom bootimages.yaml file since this is how recent MAAS packages configure what the import script imports.