tools/tests: Drop obsolete running scripts

tools/tests: Drop obsolete running scripts

The python unit tests were dropped in Xen 4.12 due to being obsolete, but the
scripts to run the tests were missed.  Clean up .gitignore as well.

Also drop the libxenctrl {C,LD}FLAGS adjustments in the Makefile.  This logic
isn't used, and isn't appropriate even in principle, as there are tests in
here which don't want to use libxenctrl.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Acked-by: Ian Jackson <ian.jackson@eu.citrix.com>