remove some remnants of the pre-0.6.1.30 tunnel build method

router/java/src/net/i2p/data/i2np/I2NPMessageImpl.java

router/java/src/net/i2p/router/InNetMessagePool.java

router/java/src/net/i2p/router/MessageHistory.java

router/java/test/net/i2p/data/i2np/TunnelCreateMessage.java

...ava/test/net/i2p/data/i2np/TunnelCreateStatusMessage.java