CLI: --network arg in `sl bmc create` is always string

It is possible to pass --network 1000 or --network 1000_DUAL. If 1000 is treated as int it will return error 'Invalid NIC speed specified'
Merge pull request #209 from loles/master

Fix sl bmc create --network 1000
Fixes Bugs with the CLI Messaging module

* Adds messaging service to the main help so it can be discovered
* Fixes an issue that occurred if the user didn't have permission to manage
  message queue accounts.
* Changes SoftLayer.exceptions.Unauthenticated to be a SoftLayerError instead of StandardError
Merge pull request #210 from sudorandom/master

Fixes Bugs with the CLI Messaging module
Fixes dictionary lookup bug. Closes #211
Merge pull request #212 from beittenc/fix_subnet_order_test

Fixes dictionary lookup bug. Closes #211