Install darkbot

Summary:
Currently, the configuration takes care to compile the source code
and configure a service, but misses the installation step.

Ref T1646

Test Plan: salt-call --local state.sls roles/shellserver/odderon

Reviewers: dereckson

Reviewed By: dereckson

Maniphest Tasks: T1646

Differential Revision: https://devcentral.nasqueron.org/D2398