findbugs correctness fixes, all over the place

...2psnark/java/src/org/klomp/snark/web/I2PSnarkServlet.java

...unnel/java/src/net/i2p/i2ptunnel/I2PTunnelClientBase.java

...unnel/java/src/net/i2p/i2ptunnel/I2PTunnelHTTPServer.java

...erconsole/java/src/net/i2p/router/web/StatSummarizer.java

...src/net/i2p/client/streaming/ConnectionPacketHandler.java

router/java/src/net/i2p/router/TunnelPoolSettings.java

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

router/java/src/net/i2p/router/tunnel/pool/TunnelPool.java