Pass NEUTRON_KUTTL_DIR to kuttl neutron env

[booxter]

The variable is now used by one of the tests that was recently added to main with:

openstack-k8s-operators/neutron-operator#406

Without setting the variable, the test fails to execute the script and fails.

Related: https://issues.redhat.com//browse/OSPRH-4296

[openshift-ci]

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[booxter]

@karelyatin FYI

[softwarefactory-project-zuul]

Build failed (check pipeline). Post recheck (without leading slash)
to rerun all jobs. Make sure the failure cause has been resolved before
you rerun jobs.

https://softwarefactory-project.io/zuul/t/rdoproject.org/buildset/2a0540c3d43043e98bb2be91f3079762

❌ openstack-k8s-operators-content-provider FAILURE in 6m 44s
⚠️ install-yamls-crc-podified-edpm-baremetal SKIPPED Skipped due to failed job openstack-k8s-operators-content-provider
⚠️ podified-multinode-edpm-deployment-crc SKIPPED Skipped due to failed job openstack-k8s-operators-content-provider

[booxter]

recheck