Util: More elimination of data copies

...ava/src/net/i2p/router/naming/BlockfileNamingService.java

...eaming/java/src/net/i2p/client/streaming/impl/Packet.java

core/java/src/net/i2p/data/DataHelper.java

core/java/src/net/i2p/data/LeaseSet2.java

core/java/src/net/i2p/data/i2cp/SessionConfig.java

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