test_scan_short: Update test URL

Signed-off-by: Toni Gundogdu <legatvs@gmail.com>
Remove "excl." from the comment

As this is a remnant of 0.4 and would suggest that LIBQUVI_SCRIPTS_DIR
value would be used "exclusively", e.g. if set, then only those paths
would be checked for the scripts.

Signed-off-by: Toni Gundogdu <legatvs@gmail.com>
Add support for LIBQUVI_EXCLUSIVE_SCRIPTS_DIR

See the libquvi.3.txt for the full description.

Signed-off-by: Toni Gundogdu <legatvs@gmail.com>
DOC: Add LIBQUVI_EXCLUSIVE_SCRIPTS_DIR

Signed-off-by: Toni Gundogdu <legatvs@gmail.com>
Merge branch 'tg/next__extend_LIBQUVI_SCRIPTS_DIR' into next
misc/scan_scripts.c: Make scripts_dir a static variable

Signed-off-by: Toni Gundogdu <legatvs@gmail.com>
misc/scan_scripts.c: Make show_dir a static variable

Signed-off-by: Toni Gundogdu <legatvs@gmail.com>