Add more Flogger details to release notes and deprecate use of SLF4J for plugins
Add more Flogger details to release notes and deprecate use of SLF4J for plugins

Create more awareness for the system properties that need to be set for
Flogger by mentioning them in the "Important Notes" section.

Also deprecate the use of SLF4J in plugins so that we can remove the
dependency to SLF4J with the next release.

Change-Id: Ia59b46dc47890f65a9b246a6b325830b7e349e54
Signed-off-by: Edwin Kempin <d43fb6c98c97e553b671ed9a9318100f1de386e7@google.com>

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