Remove obsolete Log4j config

src/main/resources/log4j-dev.properties

-log4j.rootCategory=INFO, stdout
-
-log4j.appender.stdout=org.apache.log4j.ConsoleAppender
-log4j.appender.stdout.layout=org.apache.log4j.EnhancedPatternLayout
-log4j.appender.stdout.layout.ConversionPattern=%d{ABSOLUTE} %5p %t %c{2}:%L - %m%n%throwable
-
-log4j.category.de.thm.arsnova=DEBUG
-log4j.category.com.corundumstudio.socketio=INFO
-log4j.category.com.corundumstudio.socketio.handler.AuthorizeHandler=ERROR
-log4j.category.com.corundumstudio.socketio.handler.WrongUrlHandler=WARN
-log4j.category.com.fourspaces.couchdb=WARN
-log4j.category.io.netty=INFO
-log4j.category.io.netty.channel.DefaultChannelPipeline=WARN
-log4j.category.net.sf.json=WARN
-log4j.category.org.springframework=INFO
-log4j.category.org.stagemonitor.core=OFF
-log4j.category.org.stagemonitor.requestmonitor=OFF

src/main/resources/log4j.properties

-log4j.rootCategory=INFO, stdout
-
-log4j.appender.stdout=org.apache.log4j.ConsoleAppender
-log4j.appender.stdout.layout=org.apache.log4j.EnhancedPatternLayout
-log4j.appender.stdout.layout.ConversionPattern=%d{ABSOLUTE} %5p %t %c{2}:%L - %m%n%throwable{2}
-
-log4j.category.de.thm.arsnova=INFO
-log4j.category.com.corundumstudio.socketio=INFO
-log4j.category.com.corundumstudio.socketio.handler.AuthorizeHandler=OFF
-log4j.category.com.corundumstudio.socketio.handler.WrongUrlHandler=ERROR
-log4j.category.com.fourspaces.couchdb=ERROR
-log4j.category.io.netty=WARN
-log4j.category.io.netty.channel.DefaultChannelPipeline=ERROR
-log4j.category.net.sf.json=WARN
-log4j.category.org.pac4j.oauth.profile=WARN
-log4j.category.org.springframework=INFO
-log4j.category.org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping=WARN
-log4j.category.org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping=WARN