vault-env logs all stdout to stderr

[jespada]

Describe the bug:
vault-env send "normal" logs go to stderr, this is not a problem on vault-env but in the underlining library used , logrus and its reported in other projects as well:

• Normal logs should not go to stderr argoproj/argo-cd#3491
• Use of logrus causes incorrect use of stdout and stderr containers/skopeo#1812

This causes a log parsing tool to incorrectly tag/parse the logs , marking as error things that are info or debug.

Expected behaviour:
Log level info should go to stdout not to stderr.

Steps to reproduce the bug:
Running vault-env with logging to stdout will reproduce this issue easily since all info/debug logs will go to stderr.

Environment details:

• Kubernetes version: 1.23.8
• Cloud-provider/provisioner: GKE
• bank-vaults version: 1.16.0
• Install method : helm

/kind bug