* Adds option to create default user to influxDB

Reasons for change:
- When authentication is enabled, at least one admin user must be
  available

Changes made:
- Adds job.yaml template
- This job creates a default user if job is enabled in values.yaml

Testing done:
- Deployed in cluster and verified the creation of a user in InfluxDB

* Moves job password to secret

* Bump chart version to 0.3.0