* ec2_group: Handle name conflict with empty vpc_id.
If several groups exist with the same name (and vpc_id is None) then
treat the group outside the vpc as preferred (same as it would for a vpc
group with vpc_id specified). Also don't run the egress rules code in
that case.
* Handle lack of `IpPermissionsEgress` attribute on EC2 classic groups
In EC2 classic groups, the `while True` loop checking for egress
permissions will continue infinitely.
* Handle incompatible combinations of EC2 Classic + VPC groups
* Fix integration tests in accounts lacking EC2 classic
This change checks against the security group created, instead of the
module parameters, for VPC ID. This means that new accounts with a
default VPC will still wait properly for the first egress rule to
populate.
* Fix conditional for storing described groups with preference for matching VPC IDs
* Revert `vpc_id is None` on conditional to allow for default VPCs
4bc4abfe1b