acmp: Specify SGID in PR query

If a PR query is issued with the DGID set, but the SGID not set,
then opensm version 3.3.19 (and likely others) will return a PR
with the SGID set to that of the SM.  This is a change from
previous versions of opensm, which used the SGID of the requesting
port.

In order to be safe, specify the source address as part of the
PR query, so that we get a PR that's usable for connecting to
the source.