cleanup per jikes' whining (overloaded var names, val overflow, etc)

...ava/src/net/i2p/client/RequestLeaseSetMessageHandler.java

core/java/src/net/i2p/crypto/AESInputStream.java

core/java/src/net/i2p/util/LogManager.java

core/java/src/net/i2p/util/ShellCommand.java