Support IAM token and apikeys

[allmightyspiff]

Add support for

• Token logins (like the bluemix cli)
• IBM Cloud API keys
• Mobile endpoint might be required for token auth instead of rest

[allmightyspiff]

https://sldn.softlayer.com/article/authenticating-softlayer-api/

[allmightyspiff]

http://stackoverflow.com/questions/40797208/softlayer-invalid-login-credentials-provided

[allmightyspiff]

https://cloud.ibm.com/docs/iam?topic=iam-iamtoken_from_apikey

apparently you can just use the IBM apikey to auth directly to SL, you just don't need a username.
https://cloud.ibm.com/docs/iam?topic=iam-iamapikeysforservices

 curl -s -g -u "apikey:0-------API KEY GOES HERE-------------X" 'https://api.softlayer.com/rest/v3.1/SoftLayer_Account/getObject?objectMask=mask[id,firstName]' | python -m json.tool
{
    "firstName": "Christopher",
    "id": 307608
}