Have separate Launchers for Paging and Ldp TestSuite

LdpTestSuite no longer holds the main method.  There are now two
different classes that can run the test suite: RunLdpTestSuite and
RunPagingTest
Come to think of it, we don't need to require --paging arg as this IS the paging main driver.  So I'd remove it and ensure paging it run by default.