Segment integration tests in router

router/build.gradle

router/java/build.xml

...st/junit/net/i2p/router/transport/BandwidthLimiterIT.java

.../java/test/junit/net/i2p/router/tunnel/GatewayITBase.java

...va/test/junit/net/i2p/router/tunnel/InboundGatewayIT.java

router/java/test/junit/net/i2p/router/tunnel/InboundIT.java

...a/test/junit/net/i2p/router/tunnel/OutboundGatewayIT.java

...r/java/test/junit/net/i2p/router/tunnel/RouterITBase.java