Drive hot-unplug: reliable parsing of HMP results

Hot-unplugging a disk from a guest that supports hot-unplugging generates an error
in the libvirt log when running QEMU with the "-msg timestamp=on" flag.

2015-08-06 10:48:59.945+0000: 11662: error : qemuMonitorTextDriveDel:2594 :
operation failed: deleting drive-virtio-disk4 drive failed:
2015-08-06T10:48:59.945058Z Device 'drive-virtio-disk4' not found

This error is caused because the HMP results are getting prefixed with a timestamp.
Parsing the output is not reliable with STRPREFIX as the results can be prefixed with a timestamp.

Using strstr ensures that parsing the output works whether the results are prefixed or not.

Cc: Stefan Hajnoczi <stefanha@redhat.com>
Cc: Daniel P. Berrange <berrange@redhat.com>
Signed-off-by: NFrank Schreuder <fschreuder@transip.nl>

src/qemu/qemu_monitor_text.c

@@ -2586,7 +2586,7 @@ int qemuMonitorTextDriveDel(qemuMonitorPtr mon,
 
     /* (qemu) drive_del wark
      * Device 'wark' not found */
-    } else if (STRPREFIX(reply, "Device '") && (strstr(reply, "not found"))) {
+    } else if (strstr(reply, "Device '") && strstr(reply, "not found")) {
         /* NB: device not found errors mean the drive was auto-deleted and we
          * ignore the error */
     } else if (STRNEQ(reply, "")) {