Return 1 if eepget transfer fails (fixes #576)

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

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

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

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

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