Set fips_mode_enabled in efs-utils.conf

[mpatlasov]

if env var FIPS_ENABLED is set: #1325 .

Is this a bug fix or adding new feature?

This is a bug: if the driver is run in FIPS-enabled environment, stunnel fails with "Failed to override system-wide FIPS mode" (see src/options.c from stunnel-5.72).

What is this PR about? / Why do we need it?

The PR ensures that if FIPS_ENABLED=true as env var for aws-efs csi driver, it creates efs-utils.conf with fips_mode_enabled = true.

What testing is done?

In the environment where stunnel fails with "Failed to override system-wide FIPS mode", re-create the Pod with aws-efs csi driver adding FIPS_ENABLED=true env var. Made sure that fips_mode_enabled = true is present in config and stunnel succeeds.

Fixes #1325

[k8s-ci-robot]

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This pull-request has been approved by: mpatlasov
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