Remove unused constructor parameter in ScheduledReporter.
Remove deprecated class AdminServletContextListener.

As noted in removed file, MetricsServlet.ContextListener and HealthCheckServlet.ContextListener
should be used instead.
Merge pull request #666 from tguzik/cleanup/remove-deprecated-AdminServletContextListener

Remove deprecated class AdminServletContextListener.
Merge pull request #665 from tguzik/cleanup/ScheduledReporter-remove-unused-constructor-parameter

Remove unused constructor parameter in ScheduledReporter.