Feature to filter result logging files, when using MDC Sift logging per bundle

log4j2.appender.foo.type = Routing
log4j2.appender.foo.name = MySiftingAppender
log4j2.appender.foo.routes.type = Routes
log4j2.appender.foo.routes.pattern = $\\{ctx:bundle.name}
log4j2.appender.foo.routes.bar.type = Route
log4j2.appender.foo.routes.bar.appender.type = RollingRandomAccessFile
log4j2.appender.foo.routes.bar.appender.name = RollingFile
log4j2.appender.foo.routes.bar.appender.fileName = ${karaf.data}/log/sift-$\\{ctx:bundle.name}.log
log4j2.appender.foo.routes.bar.appender.filePattern = ${karaf.data}/log/sift-$\\{ctx:bundle.name}-%i.log.gz
log4j2.appender.foo.routes.bar.appender.append = true
log4j2.appender.foo.routes.bar.appender.layout.type = PatternLayout
log4j2.appender.foo.routes.bar.appender.layout.pattern = %d{DEFAULT} %-5.5p {%t} [%C.%M()] (%F:%L) [[%X]] : %m%n
log4j2.appender.foo.routes.bar.appender.policies.type = Policies
log4j2.appender.foo.routes.bar.appender.policies.size.type = SizeBasedTriggeringPolicy
log4j2.appender.foo.routes.bar.appender.policies.size.size = 16MB
log4j2.appender.foo.routes.bar.appender.strategy.type = DefaultRolloverStrategy
log4j2.appender.foo.routes.bar.appender.strategy.max = 21
...
log4j2.rootLogger.appenderRef.Sift.ref = MySiftingAppender