Ensure eggdrops are live

Summary:
Crontab entry, helper script and configuration file to keep
eggdrops like Wearg live.

Fixes T1479.

Test Plan: Tested on Ysul

Reviewers: dereckson

Reviewed By: dereckson

Maniphest Tasks: T1479

Differential Revision: https://devcentral.nasqueron.org/D2003