Fuse 7 on Karaf: log4j2 does not support MDCSiftingAppender

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Issue

Many Fuse 6.x customers use the log4j appender class org.apache.log4j.sift.MDCSiftingAppender to specify per-bundle logging, or logging that is configured in some way using application-defined keys. This appender class does not existin in log4j2, and there is no clear alternative.

Environment

Red Hat Fuse
- 7.0
- 7.1

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