Dockernet Host Chain ID

[sampocs]

Closes: #XXX

Context and purpose of the change

The HOST_CHAINS config variable was in start_network.sh, but it should be with the other config variables in vars.sh.

Also, the chain name (i.e. STRIDE, GAIA, JUNO, etc) was often conflated with the chain-id. This PR makes the distinction which allows the adding of host chains that have more stringent restrictions on their chain ID.

Brief Changelog

• Moved HOST_CHAINS to vars.sh
• Grabbed chain ID from vars.sh instead of using the chain name everywhere
• Removed stargaze from integration tests. There are diminishing returns of running more than 3 host zones. It's computationally expensive and does not add much value.

Author's Checklist

I have...

• Run and PASSED locally all GAIA integration tests
• If the change is contentful, I either:
  • Added a new unit test OR
  • Added test cases to existing unit tests
• OR this change is a trivial rework / code cleanup without any test coverage

If skipped any of the tests above, explain.

Reviewers Checklist

All items are required. Please add a note if the item is not applicable and please add
your handle next to the items reviewed if you only reviewed selected items.

I have...

• reviewed state machine logic
• reviewed API design and naming
• manually tested (if applicable)
• confirmed the author wrote unit tests for new logic
• reviewed documentation exists and is accurate

Documentation and Release Note

• Does this pull request introduce a new feature or user-facing behavior changes?
• Is a relevant changelog entry added to the Unreleased section in CHANGELOG.md?
• This pull request updates existing proto field values (and require a backend and frontend migration)?
• Does this pull request change existing proto field names (and require a frontend migration)?
  How is the feature or change documented?
  • not applicable
  • jira ticket XXX
  • specification (x/<module>/spec/)
  • README.md
  • not documented

[asalzmann]

lgtm!