integ seems to struggle to create functional nodegroups in cn-north-1, us-gov-west-1

[cbgbt]

Issue or Feature Request:
When attempting to run integration tests with the integ tool in cn-north-1 and us-gov-west-1, nodegroups failed to create or otherwise failed to launch AMIs that would successfully join their cluster.

[cbgbt]

Possibly this is due to the ARNs not being appropriately namespaced (all using arn:aws instead of e.g. arn:aws-cn)