inquiry: add support for REFERRALS VPD page

Add support for REFERRALS VPD page and add a simple test for the
unmarshalling.

Signed-off-by: Ronnie Sahlberg <ronniesahlberg@gmail.com>
inquiry: add support for extended inquiry data

Add support for extended inquiry data and add a simple test for the
unmarshalling of this blob.

Signed-off-by: Ronnie Sahlberg <ronniesahlberg@gmail.com>
mtx: set the executable bit for the mtx tool

Signed-off-by: Ronnie Sahlberg <ronniesahlberg@gmail.com>
mtx: tweak the printouts for the status command

Print the volumetag for the media in the data transfer element if
there is a media loaded.

Don't print the volumetag for storage slots that are empty.

Signed-off-by: Ronnie Sahlberg <ronniesahlberg@gmail.com>
movemedium: add support for the move medium command

Add support for move medium. Update the mtx tool to use move medium
for load and unload. Add tests for cdb marshalling and unmarshalling.

Signed-off-by: Ronnie Sahlberg <ronniesahlberg@gmail.com>
Merge pull request #40 from sahlberg/referrals

More VPD pages and add MOVE_MEDIUM support