Hart

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Added
- Support for the af-south-1 and eu-south-1 EC2 regions.
- You can now manage a high-level resource called a "role". A role is basically
a named group of parameters to create a minion, and is usually what you'd use
in the salt topfile to allocate states to a minion.

Changed
- Digital Ocean is no longer used as the default provider if none is specified.

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Fixed
- DO crash around `--enable-ipv6` usage.

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Changed
- GCE now defaults to turning off OSLogin, assuming you want to use salt to manage ssh keys. This
can be disabled with the flag `--enable-oslogin`.

Added
- You can enable IPv6 on DO droplets by passing `--enable-ipv6`.

Fixed
- GCE picks the only available subnet if none was specified.
- GCE hang when creating salt-master.
- EC2 crashed if trying to list available subnets.
- EC2 can now manage minions in non-standard VPCs.

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Fixed
- Crash when printing user errors.
- Minion keys are no longer on disk if node failed to connect.
- GCE will now automatically pick the available subnet and network in a zone, and enables
specifying this with --subnet if ambigious.

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Fixed
- GCE didn't detect init script completion after some changes on Google's side.

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Fixed
- Crash when creating minion when fetching pubkey.