SLF4J: Class path contains multiple SLF4J bindings

Prior to OpenAM 12, we used to have our own logging framework using SLF4J and LogBack, instead of default logging framework that comes default with OpenAM. 

In OpenAM 12, multiple SLF4J bindings errors are thrown if both logging framework co-exist.

SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/data/opt/apache-tomcat-8.0.26/webapps/auth/WEB-INF/lib/openam-slf4j-12.0.2.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/data/opt/apache-tomcat-8.0.26/webapps/auth/WEB-INF/lib/logback-classic-1.1.3.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
SLF4J: Actual binding is of type [org.forgerock.openam.slf4j.AMLoggerFactory]


Need to handle carefully.

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