* [VAULT-1618] Agent error log level is mismatched

`logLevelToStringPtr` translates `go-hclog`'s `ERROR` to `"ERROR"` for
Consul Template's runner, but that expects `ERR` and is quite strict
about it.

This will address https://github.com/hashicorp/vault-k8s/issues/223


after it is set as the default image in `vault-k8s`.

I didn't find a simple way to test this other than starting up a full
server and agent and letting them run, which is unfortunately fairly
slow.

I confirmed that this addresses the original issue by modifying the helm
chart with the values in this commit and patching the log level to `err`.

* VAULT-1618 Add changelog/14424.txt

* VAULT-1618 Update changelog/14424.txt based on @kalafut suggestion
Co-authored-by: Jim Kalafut <jkalafut@hashicorp.com>

* VAULT-1618 Move cancel and server stop into defer in tests

* VAULT-1618 Triggering CircleCI tests

* VAULT-1618 Replace ioutil with os functions for agent template tests
Co-authored-by: Jim Kalafut <jkalafut@hashicorp.com>