CAPI-222: lowercase account.givenName attribute name
CAPI-222: lowercase account.givenName attribute name

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