logback initialization throws UnknownHostException when host name is not resolvable.

This issue appears to be fixed in logback/1.0.13. Upgrade logback version to 1.0.13

See http://jira.qos.ch/browse/LOGBACK-749 for details.

The following error is seen during logback initialization.

13:18:51,263 |-ERROR in ch.qos.logback.core.util.ContextUtil@73a2efd3 - Failed to get local hostname java.net.UnknownHostException: YYYYYYYYYYYYYYY : nodename nor servname provided, or not known
at java.net.UnknownHostException: YYYYYYYYYYYYYYY: nodename nor servname provided, or not known
at at java.net.InetAddress.getLocalHost(InetAddress.java:1473)
at at ch.qos.logback.core.util.ContextUtil.getLocalHostName(ContextUtil.java:32)
at at ch.qos.logback.core.util.ContextUtil.addHostNameAsProperty(ContextUtil.java:41)
at at ch.qos.logback.classic.joran.action.ConfigurationAction.begin(ConfigurationAction.java:56)
at at ch.qos.logback.core.joran.spi.Interpreter.callBeginAction(Interpreter.java:276)
at at ch.qos.logback.core.joran.spi.Interpreter.startElement(Interpreter.java:148)
at at ch.qos.logback.core.joran.spi.Interpreter.startElement(Interpreter.java:130)
at at ch.qos.logback.core.joran.spi.EventPlayer.play(EventPlayer.java:50)
at at ch.qos.logback.core.joran.GenericConfigurator.doConfigure(GenericConfigurator.java:157)
at at ch.qos.logback.core.joran.GenericConfigurator.doConfigure(GenericConfigurator.java:143)
at at ch.qos.logback.core.joran.GenericConfigurator.doConfigure(GenericConfigurator.java:106)
at at ch.qos.logback.core.joran.GenericConfigurator.doConfigure(GenericConfigurator.java:56)
at at ch.qos.logback.classic.util.ContextInitializer.configureByResource(ContextInitializer.java:75)
at at ch.qos.logback.classic.util.ContextInitializer.autoConfig(ContextInitializer.java:148)
at at org.slf4j.impl.StaticLoggerBinder.init(StaticLoggerBinder.java:85)
at at org.slf4j.impl.StaticLoggerBinder.<clinit>(StaticLoggerBinder.java:55)
at at org.slf4j.LoggerFactory.bind(LoggerFactory.java:128)
at at org.slf4j.LoggerFactory.performInitialization(LoggerFactory.java:107)
at at org.slf4j.LoggerFactory.getILoggerFactory(LoggerFactory.java:295)
at at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:269)
at at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:281)