Ability to set domains for use with Statiscs module only

[tonioo]

From @tonioo on December 4, 2013 15:43

Originally created by Mike C on 2012-07-08T23:11:16Z

I was trying to get Statistics working and had some problems.

If one is only using the "default" and "amavis" Databases but not "pfxadmin" we cannot create domains, maybe because they are not needed?

Except for statics, because the script will "see" all domains as "global" while parsing the log.

Its important to have the possibility to add domains for stats only to get arround this problem.

Copied from original issue: modoboa/modoboa#289