Support generating structured logs in addition to standard logs. (#8607)

This modifies the configuration of structured logging to be usable from
the standard Python logging configuration.

This also separates the formatting of logs from the transport allowing
JSON logs to files or standard logs to sockets.

synmark/__main__.py

@@ -12,20 +12,20 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
-
 import sys
 from argparse import REMAINDER
 from contextlib import redirect_stderr
 from io import StringIO
 
 import pyperf
-from synmark import make_reactor
-from synmark.suites import SUITES
 
 from twisted.internet.defer import Deferred, ensureDeferred
 from twisted.logger import globalLogBeginner, textFileLogObserver
 from twisted.python.failure import Failure
 
+from synmark import make_reactor
+from synmark.suites import SUITES
+
 from tests.utils import setupdb