add bare metal support for SoftLayer

[mgogoulos]

Bare Metal support for SoftLayer (and a few improvements)

Description

• add support for SoftLayer bare metal servers (http://www.softlayer.com/bare-metal-servers)
  This includes listing, create, stop/start/reboot/destroy of nodes
• for nodes return full cost via node.extra('billingItemChildren'). Currently nodes include a node.extra('recurringFee') price that is only for the compute - CPU pricing. Other costs (ram, bandwidth, image, disk) are included now on billingItemChildren.
• add a few data centers missing
• add missing states
• add a few more size templates (were useful to us in many cases)
• add extra node metadata

Status

done, ready for review

Checklist (tick everything that applies)

• Code linting (required, can be done after the PR checks)
• Documentation
• Tests
• ICLA (required for bigger changes)

[tonybaloney]

thanks @mgogoulos the CI server is coming back with some errors from the test suite https://travis-ci.org/apache/libcloud/jobs/208183305

[stale]

Thanks for contributing to this issue. As it has been 90 days since the last activity, we are automatically marking is as stale. If this issue is not relevant or applicable anymore (problem has been fixed in a new version or similar), please close the issue or let us know so we can close it. On the contrary, if the issue is still relevant, there is nothing you need to do, but if you have any additional details or context which would help us when working on this issue, please include it as a comment to this issue.

[Kami]

First thank you for your contribution.

This PR is very old and out of date now so I will go ahead and close it.

If it's still relevant, please sync your changes with the latest master / trunk and open a new PR. Thanks!