Fix initialize.sh to create /var/spool/mlab_ooni

[nathan-at-least]

(This text originally came from #21 which is an umbrella ticket.)

After running initialize.sh, we tried to run start.sh and got the error message Invalid archive directory: /var/spool/mlab_ooni!. We had to create this directory manually. To fix this, make initialize.sh create the directory when necessary.

[defuse]

There is a similar directory, /var/spool/raw_reports (the report_dir). Identify where that directory is created and create /var/spool/mlab_ooni (the archive_dir) just after it.

[defuse]

I fixed it here: https://github.com/LeastAuthority/ooni-support/commit/3949cd5c7967a5bee1046e451790787af97626d8

[defuse]

Oh, oops, that branch includes the other changes. Hang on... I need to create a branch off of master.

[defuse]

Here's a pull request to fix this. #37

Assigning @nathan-at-least to close this ticket.

[nathan-at-least]

I reviewed the diff and it seems fine enough.