Is us-gov-west-1 not automatically listed as a region? Current versions of Foreman/fog should accept it.

This is indeed supported in latest stable version of Foreman, this has been cloned from bugzilla which is a request for backport which is unlikely to happen due to complexity of the hardcoded code in fog-aws, the only viable choice is to rebase fog/fog-aws downstream (which can be problematic too).

This is still an issue, turns out govcloud region must be set explicitly before we ask for available regions. A simple checkbox in the form will do.

Applied in changeset a6cf3a531b524d85c94fb0acefa3bb72b5e7574a.