units: remove old test.units target

The old implementation is complicated after incremental extending.
Now test.units target is just an alias for units target.

Signed-off-by: Masatake YAMATO <yamato@redhat.com>
units: fix a bug in reporting the number of passed results

In old code, the number is returned from a function(count_list).
However, it seems that a function cannot return larger number.
So this patch lets count_list print the number directly instead
of returning it.

Signed-off-by: Masatake YAMATO <yamato@redhat.com>
units: simplify the definition of clean-units target

Signed-off-by: Masatake YAMATO <yamato@redhat.com>
units: Allow selection of units of multiple languages

Suggested by @vhda in #118.
member_p helper function is used.

Signed-off-by: Masatake YAMATO <yamato@redhat.com>