Properly calculate hash of EC2NodeClass for ISO regions

[amdonov]

Fixes #7081

Description

In ISO regions the httpProtocolIPv6 feature is not supported. The current code correctly handles this by setting HTTPProtocolIPv6 to nil in unsupported regions. However, the EC2NodeClass spec still contains the default value for HTTPProtocolIPv6 (which is "disabled"). When the hash is calculated, it includes the entire Spec which has HTTPProtocolIPv6: "disabled". But when the launch template is created, HTTPProtocolIPv6 is set to nil (omitted). This creates a mismatch between what's in the NodeClass hash and what's actually deployed. This code properly sets the hash value for the NodeClass.

How was this change tested?

Unit tests

Does this change impact docs?

• [x] No

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

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