When creating a new IAM policy version with create_policy_version, we cannot use the length of the versions list to calculate VersionId. Keep track of the next version id to use as a non-decreasing counter. Fixes #2157
When creating a new IAM policy version with create_policy_version, we cannot use the length of the versions list to calculate VersionId. Keep track of the next version id to use as a non-decreasing counter. Fixes #2157