Updated openstack/openstack
Project: openstack-infra/devstack-gate  e4e1917a0461ba9f71e12fc699686cf282925425
null
Allow concurrency to be tweaked for tempest

This adds a knob for tweaking the tempest concurrency, but sets the
default to 4 (what we run at now by default).

This was borrowed from https://review.opensta+ck.org/#/c/58605/3

Change-Id: I90f7da9f6d72858abf58aff35aa2037de4b5e0af