Add Nasqueron Vault CA certificate to image

Summary:
Deploy it according the underlying Debian userland recommandations.

Allow Python requests library to access it through $REQUESTS_CA_BUNDLE
environment variable.

Ref T1812

Test Plan:

import requests
response = requests.post("https://172.27.27.7:8200")
response.status_code

Reviewers: dereckson

Reviewed By: dereckson

Maniphest Tasks: T1812

Differential Revision: https://devcentral.nasqueron.org/D3271