test_scratch_build_config: avoid flexmock args comparison, and avoid race
test_scratch_build_config: avoid flexmock args comparison, and avoid race

Signed-off-by: Tim Waugh <fe049355006bf7fdd11c5e47ffe7a5032af30704@redhat.com>

DBuildService/osbs-client,vrutkovs/osbs-client,vrutkovs/osbs-client,bfontecc007/osbs-client,bfontecc007/osbs-client,DBuildService/osbs-client,projectatomic/osbs-client,projectatomic/osbs-client