call UUID setter in Profile UUID update so it updates NodeList
Merge pull request #1633 from birarda/master

fix for NodeList UUID not updating
Merge branch 'master' of https://github.com/worklist/hifi
only set UUID when not null, properly send UUID from data-server
Merge pull request #1635 from birarda/packet-sender

fix null UUIDs
Merge branch 'master' of https://github.com/worklist/hifi
add debugging for UUID owner change on NodeList
Merge pull request #1639 from birarda/master

add debugging for UUID owner change on NodeList
Merge branch 'master' of https://github.com/worklist/hifi