tape: add/use rust scsi changer implementation using libsgutil2

src/tape/changer/mtx/mod.rs

@@ -0,0 +1,7 @@
+//! Wrapper around expernal `mtx` command line tool
+
+mod parse_mtx_status;
+pub use parse_mtx_status::*;
+
+mod mtx_wrapper;
+pub use mtx_wrapper::*;