[3.7] bpo-34279: Synchronize regrtest with master#10800

Merged

vstinner merged 3 commits intopython:3.7from

vstinner:regrtest37

Nov 29, 2018

Commits on Nov 29, 2018

bpo-34605, libregrtest: Rename --slaveargs to --worker-args (GH-9099)
vstinner
committed
bpo-34279, regrtest: Issue a warning if no tests have been executed (GH-10150)

pablogsal
authored and
vstinner
committed
test_regrtest: remove unused threading import
vstinner
committed