Split coverage target into regular and sub-target
Split coverage target into regular and sub-target

I don't think it will be very useful to spill out html output on Jenkins
tests. The report also indicates what has been omitted, and we do not
expect anything to be omitted very often.

Signed-off-by: mulhern <7b51bcf507bcd7afb72bf8663752c0ddbeb517f6@redhat.com>

stratis-storage/stratis-cli,stratis-storage/stratis-cli