[LOGGING-186] Replace custom code with ServiceLoader call (#171)

* Replace custom code with `ServiceLoader` call

* Files should end with an empty line

* Files should end with an empty line

* Comment empty block

* Comment empty block

---------

Co-authored-by: Gary Gregory <garydgregory@users.noreply.github.com>

src/test/resources/serviceloader/META-INF/services/org.apache.commons.logging.LogFactory

@@ -0,0 +1,25 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, 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.
+##
+# Version 1.2 of Apache Commons Logging did not support comments in the service file.
+#
+# A class that does not implement LogFactory to emulate services the implement
+# LogFactory for another classloader
+org.apache.commons.logging.serviceloader.internal.ThrowingLogFactory
+##
+# A proper LogFactory
+org.apache.commons.logging.serviceloader.internal.DummyLogFactory

src/test/resources/serviceloader/README.txt

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+Contains resources used exclusively by `ServiceLoaderTestCase`