Makefile target names

[David Britton]

+1, but I would propose using hyphens for word separators, not
underscores -- at least for the recommendation.  I would also recommend
*not* having multiple default names.

As mentioned, the yaml control file I think can be used to override all
this, so it still leaves room for individual preferences on the exact
namings.

unit tests:
 - make test

unit tests dependencies:
 - make test-depends

functional tests:
 - make functional-test

lint:
 - make lint

charm-helpers upstream sync:
 - make sync

-- 
David Britton <david.britton at canonical.com>