cleanup: inline STRG_*SCSI_* macros

They are used only once; their name is less clear than their content.

Change-Id: I80c54e1c398ea46badb1e57b3c446fefa9122581
Signed-off-by: Dan Kenigsberg <danken@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/14256