Add support for writing oonibackend reports using the mlab format
In order to have the reports collected by the mlab batch script and inserted into google cloud storage and place in bigtable they need to follow a certain file path structure.
That is they need to be written to /var/spool/mlab_ooni/{YYYY}/{MM}/{DD}/{YYYYMMDD}T{HH}:{MM}:{SS}whatever.whatever
for example:
/var/spool/mlab_ooni/2014/09/22/20140922T00:15:53.91145000Z_198.254.193.142:62217.whatever
The first directory part can be picked by changing the oonib.conf archive_dir option. I think the later should be a flag that can be enabled or disabled to write reports to directories formatted in that way.
It could be called "date_archive: true|false".