uniform unit test labels

tests/unit/ps-dockerfile.bats

@@ -10,7 +10,7 @@ teardown() {
   destroy_app
 }
 
-# @test "ps (dockerfile)" {
+# @test "(ps) dockerfile" {
 #   # CI support: 'Ah. I just spoke with our Docker expert --
 #   # looks like docker exec is built to work with docker-under-libcontainer,
 #   # but we're using docker-under-lxc. I don't have an estimated time for the fix, sorry
@@ -21,7 +21,7 @@ teardown() {
 #   assert_success
 # }
 
-@test "ps (dockerfile)" {
+@test "(ps) dockerfile" {
   run bash -c "dokku ps:stop $TEST_APP"
   echo "output: "$output
   echo "status: "$status