Util: Consolidate linux service detection code

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

...sole/java/src/net/i2p/router/web/RouterConsoleRunner.java

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

router/java/src/net/i2p/router/startup/WorkingDir.java

router/java/src/net/i2p/router/tasks/OOMListener.java

...ava/src/net/i2p/router/tunnel/BloomFilterIVValidator.java