Provide reload and graceful commands to eggdrop service

Summary:

• reload to send a SIGHUP signal (kill -1)
• graceful to send a SIGQUIT signal (kill -3)

Ref T1323

Test Plan: Tested with Aeschere, Weag and Dæghrefn

Reviewers: dereckson

Reviewed By: dereckson

Maniphest Tasks: T1323

Differential Revision: https://devcentral.nasqueron.org/D1945