PUBAPI-954: make possible deletion of optional sub-user properties
PUBAPI-954: make possible deletion of optional sub-user properties

misterbisson/sdc-cloudapi,KrisShannon/sdc-cloudapi,misterbisson/sdc-cloudapi,arekinath/sdc-cloudapi,KrisShannon/sdc-cloudapi,joyent/sdc-cloudapi,joyent/sdc-cloudapi,arekinath/sdc-cloudapi