* Router: Move addShutdownTask from Router to I2PAppContext

apps/i2psnark/java/src/org/klomp/snark/SnarkManager.java

...console/java/src/net/i2p/router/web/ConfigNetHandler.java

...onsole/java/src/net/i2p/router/web/ConfigRestartBean.java

...ole/java/src/net/i2p/router/web/ConfigServiceHandler.java

...terconsole/java/src/net/i2p/router/web/UpdateHandler.java

core/java/src/net/i2p/I2PAppContext.java

router/java/src/net/i2p/router/Router.java