Create log4j appender to feed logs into the scan-manager-core

[ayomawdb]

Description:
Currently a util is used to feed log messages to the scan-manager-core. This logic should be moved into a log4j log appender and only the log appender should know how to call "log" service and persist logs to the server.

Once done, we should use two appenders in the log4j configuration for scanner implementations:

1. Log everything to a local rotated log file
2. Log everything to the scan-manager-core (over a rest call)

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