Provision eggdrop configuration

Summary:
The /srv/viperserv directory is provisionned with both global files and
files per eggdrop instance.

Eggdrop starts reading a configuration file prepared from eggdrop-bot.conf.
Then, this file loads eggdrop-core.conf.

Scripts list and egg config are stored in the pillar viperserv_bots entry.

Test Plan: Run Dæghrefn, Wearg and TC2

Reviewers: dereckson

Reviewed By: dereckson

Differential Revision: https://devcentral.nasqueron.org/D1209