Changes

stream_srv: keep sockname in iofd name if a stream name is explicitly set

This matches with how we log in eg. LOGSRV() macro. In essence, the user
doesn't need to care about requesting to log the sockname, that's
internally done in all cases. Instead, the stream set_name() is used to
log more upper-layer information.

Change-Id: I8f95b3a1cae66d39f7b83a4022880ab390b7715e