Raise utility testing over 95%
These modules perform utility functionality that we should be able to get to a very high testing coverage rate.
x/memarea.c.gcov 20 85 80.95
x/util.c.gcov 484 1263 72.30
x/util_format.c.gcov 11 183 94.33
x/workqueue.c.gcov 34 117 77.48
x/address.c.gcov 77 595 88.54
x/log.c.gcov 274 274 50.00
(In the case of one or two of these, they might be actually compatibility stuff. In which case, compatibility stuff should move into new compat_* modules to be considered under legacy/trac#16798 (moved))