Add missing test for overriding managed-record-types

[jkremser]

Description

Very little change that adds the test case that verifies that overriding the config works also for managed-record-types (env vars and cli params). The test file works as a good source of documentation for newcomers and it helped me to realise what's the env var name of the cli param and vice-versa. The EXTERNAL_DNS_MANAGED_RECORD_TYPES was missing here though so I was puzzled what to use..

Checklist

• Unit tests updated
• End user documentation updated (very minor change for this)

Signed-off-by: Jirka Kremser jiri.kremser@gmail.com

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[jkremser]

/assign @njuettner

[Raffo]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jkremser, Raffo

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