Install vault-medusa and roll on devserver role

Summary:
Both packages are now available from the Nasqueron packages repository:

roll-2.6.1                     Roll dices using dice expressions
vault-medusa-0.7.2             Exporter for Vault data

Fixes T2037.
Fixes T2046.

Test Plan: Deployed on WindRiver

Reviewers: DorianWinty

Reviewed By: DorianWinty

Maniphest Tasks: T2046, T2037

Differential Revision: https://devcentral.nasqueron.org/D3499