Write asn/user blob
Write asn/user blob

Per RFC, `exec newuser TYPE` must write TYPE to 'asn/user' blob.

Reported-by: Eliot Dresselhaus <73528cb02ee3477ce1ac4789f9c89485ebc34fe6@apptimist.co>
Signed-off-by: Tom Grennan <96835dd8bfa718bd6447ccc87af89ae1675daeca@apptimist.co>

apptimistco/asn,apptimistco/asn