Add Deployment-Automation for InfluxDB Nodes

[ferricoxide]

Rationale

GitLab can be enabled to track and report on service-metrics (see: GitLab Performance Monitoring). To support this capability, GitLab needs to be able to write to and extract date from the InfluxDB time-series DBMS.

Solution Description

Add CFn stack(s) — and Jenkins job-descriptions to drive them — for deploying InfluxDB nodes — or (if it isn't overkill/too cost-intensive) InfluxDB clusters (see discussion at High availability for InfluxDB)