qemumonitortestutils: Split lines on \n instead of \r\n

The normal monitor uses windows line endings, where the agent monitor
uses only newlines. Change this to tolerate both approaches and allow to
use the utilities for guest agent tests.

tests/qemumonitortestutils.c

@@ -201,7 +201,7 @@ qemuMonitorTestIO(virNetSocketPtr sock,
          * if so, handle that command
          */
         t1 = test->incoming;
-        while ((t2 = strstr(t1, "\r\n"))) {
+        while ((t2 = strstr(t1, "\n"))) {
             *t2 = '\0';
 
             if (qemuMonitorTestProcessCommand(test, t1) < 0) {
@@ -209,7 +209,7 @@ qemuMonitorTestIO(virNetSocketPtr sock,
                 goto cleanup;
             }
 
-            t1 = t2 + 2;
+            t1 = t2 + 1;
         }
         used = t1 - test->incoming;
         memmove(test->incoming, t1, test->incomingLength - used);