updating to 5.2.15

[allmightyspiff]

• Added dedicated host info to virt detail
• createObjects methods do not work with REST API #885 - Fixed createObjects on the rest api endpoint
• changed securityGroups to use createObject instead of createObjects
• Always set the endpoint_url by defaulting to the public URL if the endpoint type cannot be determined.
• resource metadata update

[coveralls]

Coverage remained the same at 85.603% when pulling 82eeb3f on allmightyspiff:master into de19801 on softlayer:master.