XD-1153 Use Native Tail Adapter in Test Fixture

Test fixture used 'end="false"' instead of 'lines=+0'.

Adding the 'end' option inadvertently caused the Apache Tailer
to be used.

Change the test fixture to use the native adapter.

Add new properties to the tail source to allow complete control
over which adapter is used. Using the Apache adapter requires
setting `native-options=''` together with one or more of the
Apache properties (delay, fromEnd, reOpen), to use the Apache
adapter.

Use a POJO for ModuleOptions