Router: Stub out capabilities P and X (ticket #1447)

history.txt

router/java/src/net/i2p/data/router/RouterInfo.java

router/java/src/net/i2p/router/Router.java

router/java/src/net/i2p/router/RouterVersion.java

router/java/src/net/i2p/router/peermanager/PeerManager.java

router/java/src/net/i2p/router/transport/TransportImpl.java