Merge fixes to debugging messages from FreeBSD:

Merge fixes to debugging messages from FreeBSD:

rev 1.11
Replace all the ifdef debugging spaghetti with a single ifdef and
a macro so that it is easier to read the flow of the code.

revs 1.12-1.13
We already have these.

revs 1.36-1.37
Add debugging to rman_manage_region() as well.  This is useful since we
manage subregions in ACPI.

rev 1.39
Fix a debugging printf.  The order of start/end was inconsistant with
all the other start/end debugs, causing momentary confusion when the
output was examined.