cleanups using getProperty(String, int)

router/java/src/net/i2p/router/LoadTestManager.java

router/java/src/net/i2p/router/RouterThrottleImpl.java

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

...a/src/net/i2p/router/transport/FIFOBandwidthRefiller.java

...er/java/src/net/i2p/router/tunnel/pool/BuildExecutor.java