See http://lists.openstack.org/pipermail/openstack-discuss/2019-July/007708.html Change-Id: If97f10290c16903d550c66163b082bd23357fca2
Coverage was failing as coverage target was deleting coverage data before coverage html was run as a side-effect of running coverage combine. This change fixes it. Change-Id: I08c974724cc81423f4d440a88d704cfafb75829f