Relax Edge Cluster setting restrictions for Tier0/1 routers and ASN

[spacegospod]

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Summary of Pull Request

Making Tier 0 router name optional again and relaxing ASN restrictions while preserving the range limit.

Type of Pull Request

• This is a bug fix.
• This is an enhancement or feature.
• This is a code style/formatting update.
• This is a documentation update.
• This is a refactoring update.
• This is a chore update
• This is something else.
  Please describe:

Related to Existing Issues

Closes #293
Closes #294

Test and Documentation Coverage

For bug fixes or features:

• Tests have been completed.
• Documentation has been added/updated.

Breaking Changes?

• Yes, there are breaking changes.
• No, there are no breaking changes.