* origin/topic/seth/log-framework-ext:
Log extensions: series of small fixes and new tests.
Change the function for log extension to take a path only and update tests.
Final changes to log framework ext code.
Add logging framework metadata mechanism.
Add unrolling separator & field name map to logging framework.
The extensions now work with optional types, as well with complex types
(like subrecords). Not returning a record in the ext_func no longer
crashes bro.
The default_ext_func was switched to return void in
cases where no extension revord is defined (was bool).
I also got rid of the offsets in the indices - with the rest of the
implementation, that was not really necessary and made the code more
complex.