Miscellaneous fixes.

1) Check the return value from st_mount_tape().

2) Always call st_unmount() if the media goes missing.

3) Use the special handling for 'Unit in the process of becoming
ready' for the TEST UNIT READY command in stopen().

4) Don't unmount a tape during stopen() just because it doesn't have
the current default density. Eliminate now unused last_dsty member of
st_softc.

tested & ok beck@

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