BuiltResponse.close() should also call ResteasyProviderFactory.clearInstanceIfEqual

ClientFilterResponseBuilderTest causes tests AllowGzipOnServerAllowGzipOnClientTest
and NotAllowGzipOnServerAllowGzipOnClientTest to fail. The cause is the test
is creating an instance of ResteasyProviderFactory that is not (closed) cleaned-up
after use. This instance lives on into the following tests which causes them to fail.
The failure is unique to ClientFilterResponseBuilderTest because this test
registers a ClientResponseFilter implementation (class ResponseBuilderCustomResponseFilter)
which creates a new response object. The call to response.readEntity() causes
a new ResteasyProviderFactory to be created so a message reader can be found.
Method readEntity calls BuiltResponse.close() but it only sets a flag currently.
It does not check the ResteasyProviderFactory, "instance" value.