Break out Journal EventLog

As part of a EventLog refactor, break out all code
used for Systems Journal EventLog, in order to make the code base
more maintainable in the long run.

Tested: Only code

Break out Journal EventLog

As part of a EventLog refactor, break out all code
used for Systems Journal EventLog, in order to make the code base
more maintainable in the long run.

Tested: Only code extraction. Code compiles.

Change-Id: I855c8c680d3de68944b0ae03ff7f181e6790c456
Signed-off-by: Oliver Brewka <oliver.brewka@9elements.com>

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