Add integration tests for complete channel upgrade handshake

[ljoss17]

Summary

Add tests for different channel upgrade scenarios.

Proposal

Add tests for the following channel upgrade cases:

• 4 tests, for upgrading each individual field:
  • upgrading Version
  • upgrading ConnectionHops
  • upgrading Ordering from Ordered to Unordered accepted
  • upgrading Ordering from Unordered to Ordered rejected
• 3 tests, for the different timeouts possibilities:
  • only TimeoutHeight set
  • only TimeoutTimestamp set
  • both TimeoutHeight and TimeoutTimestamp set
• 1 test for ChannelUpgradeCancelMsg

---

For Admin Use

• [ ] Not duplicate issue
• [ ] Appropriate labels applied
• [ ] Appropriate milestone (priority) applied
• [ ] Appropriate contributors tagged
• [ ] Contributor assigned/self-assigned