ibmcloud: Add Platform Provisioning Check

[hasueki]

This adds platform provisioning check support for IBM Cloud. The check will validate if there's already a conflicting Kube API DNS record present in the user-provided CIS instance.

Changes:

• New validation function to check DNS records, ValidatePreExitingPublicDNS()
• New client method for fetching DNS records, GetDNSRecordsByName()
• Rename client method,GetZoneIDByName() --> GetDNSZoneIDByName()
• Unit test for new validation function
• Move validation test suite to ibmcloud package
• Move custom type definitions, DNSZoneResponse{} and EncryptionKeyResponse{} to pkg/types/ibmcloud

[jstuever]

/lgtm
/approve

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jstuever

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[jstuever]

/retest

[openshift-ci]

@hasueki: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Rerun command
ci/prow/e2e-openstack-kuryr	d335862	link	/test e2e-openstack-kuryr
ci/prow/e2e-crc	d335862	link	/test e2e-crc
ci/prow/e2e-libvirt	d335862	link	/test e2e-libvirt
ci/prow/e2e-aws-workers-rhel7	d335862	link	/test e2e-aws-workers-rhel7

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