Support DIRECT access via ggated and ggatec.

ggatec supports specifying -o direct in addition to the typical rw/wo/ro access specifier to request DIRECT access from ggated.

ggated supports adding ,DIRECT and ,NODIRECT on export lines. Specfying DIRECT will force any accesses to have DIRECT set, setting NODIRECT will preclude any a client from choosing DIRECT. Not specificed allows the client to request (or not)

ggated exports of:
host RO /path/ggated/ro
host RW /path/ggated/rw
host WO /path/ggated/wo
host RO,DIRECT /path/ggated/rod
host RW,DIRECT /path/ggated/rwd
host WO,DIRECT /path/ggated/wod
host RO,NODIRECT /path/ggated/rond
host RW,NODIRECT /path/ggated/rwnd
host WO,NODIRECT /path/ggated/wond

Client tested with:
./ggatec create -o ro server /path/ggated/ro
./ggatec create -o rw server /path/ggated/ro
./ggatec create -o wo server /path/ggated/ro

./ggatec create -o ro -o direct server /path/ggated/ro
./ggatec create -o wo -o direct server /path/ggated/ro
./ggatec create -o wo -o direct server /path/ggated/ro

./ggatec create -o ro server /path/ggated/wo
./ggatec create -o rw server /path/ggated/wo
./ggatec create -o wo server /path/ggated/wo

./ggatec create -o ro -o direct server /path/ggated/wo
./ggatec create -o rw -o direct server /path/ggated/wo
./ggatec create -o wo -o direct server /path/ggated/wo

./ggatec create -o ro server /path/ggated/rw
./ggatec create -o wo server /path/ggated/rw
./ggatec create -o rw server /path/ggated/rw

./ggatec create -o ro -o direct server /path/ggated/rw
./ggatec create -o wo -o direct server /path/ggated/rw
./ggatec create -o rw -o direct server /path/ggated/rw

./ggatec create -o ro server /path/ggated/rod
./ggatec create -o wo server /path/ggated/rod
./ggatec create -o rw server /path/ggated/rod

./ggatec create -o ro -o direct server /path/ggated/rod
./ggatec create -o wo -o direct server /path/ggated/rod
./ggatec create -o rw -o direct server /path/ggated/rod

./ggatec create -o ro server /path/ggated/wod
./ggatec create -o wo server /path/ggated/wod
./ggatec create -o rw server /path/ggated/wod

./ggatec create -o ro -o direct server /path/ggated/wod
./ggatec create -o wo -o direct server /path/ggated/wod
./ggatec create -o rw -o direct server /path/ggated/wod

./ggatec create -o ro server /path/ggated/rwd
./ggatec create -o wo server /path/ggated/rwd
./ggatec create -o rw server /path/ggated/rwd

./ggatec create -o ro -o direct server /path/ggated/rwd
./ggatec create -o wo -o direct server /path/ggated/rwd
./ggatec create -o rw -o direct server /path/ggated/rwd

./ggatec create -o ro server /path/ggated/rond
./ggatec create -o wo server /path/ggated/rond
./ggatec create -o rw server /path/ggated/rond

./ggatec create -o ro -o direct server /path/ggated/rond
./ggatec create -o wo -o direct server /path/ggated/rond
./ggatec create -o rw -o direct server /path/ggated/rond

./ggatec create -o ro server /path/ggated/wond
./ggatec create -o wo server /path/ggated/wond
./ggatec create -o rw server /path/ggated/wond

./ggatec create -o ro -o direct server /path/ggated/wond
./ggatec create -o wo -o direct server /path/ggated/wond
./ggatec create -o rw -o direct server /path/ggated/wond

./ggatec create -o ro server /path/ggated/rwnd
./ggatec create -o wo server /path/ggated/rwnd
./ggatec create -o rw server /path/ggated/rwnd

./ggatec create -o ro -o direct server /path/ggated/rwnd
./ggatec create -o wo -o direct server /path/ggated/rwnd
./ggatec create -o rw -o direct server /path/ggated/rwnd

Validated via a (removed) debugging logline that showed the open(2) flags. All flags passed correctly.