Get rid of UMA zones and instead allocate all ecb's up front and track them

in a TAILQ.  Re-arrange some of the ecb elements so that they can stay
stable through alloc/free cycles while the rest get bzero'd.

- Use the tag_id from the ecb rather than fro the ccb.  The latter is only
for target mode.

- Honor the ccb flags for tag_action when deciding whether to do a tagged
or untagged transaction.

- Re-arrange autosense completion so that it works correctly in failure
cases.

- Turn on the PI_TAG_ABLE flag so that CAM will send us tagged transactions.

This enables tagged queueing in the driver.

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