component/nxdtest: v↑ (properly cancel on SIGTERM/SIGINT)

This upgrade teaches nxdtest to properly cancel test run and test job
when it receives SIGTERM or SIGINT.

See nxdtest@6f75fa90...56e52da6 for details.

/reviewed-by @jerome
/reviewed-on !1121
5 jobs for master
in 0 seconds, using 0 compute credits, and was queued for 0 seconds