veyron/services/mgmt/binary/binaryd/test.sh: use dynamic HTTP port.
veyron/services/mgmt/binary/binaryd/test.sh: use dynamic HTTP port.

Building on https://veyron-review.googlesource.com/#/c/6539/, this change greps
the address of the HTTP server from the log and uses that instead of assuming a
hardcoded address. Also depends on
https://veyron-review.googlesource.com/#/c/6541/ for access to the server's log.

Change-Id: Id3fa9f35869109dcdaca6da85d6b6004c423d671

vanadium/go.ref,vanadium/go.ref,vanadium/go.ref,vanadium/go.ref,vanadium/go.ref,vanadium/go.ref