Break out DBus EventLog

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

Tested: Only code extrac

Break out DBus EventLog

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

Tested: Only code extraction. Code compiles.

Change-Id: I94de7bf3171fd3963eebec6608438f8d07cee44c
Signed-off-by: Oliver Brewka <oliver.brewka@9elements.com>

show more ...