virtio_console.py: update and extend test for boot_to_much_ports

virtio_console.cfg: disable loopback test between consoles
Signed-off-by: NSitong Liu <siliu@redhat.com>

qemu/tests/cfg/virtio_console.cfg

@@ -61,6 +61,8 @@
                             virtio_console_test = rw_host_offline_big_data
                         - rw_blocking_mode:
                             only Linux
+                            # Works with virtconsole, but is not the comon usage, don't test by default
+                            only virtserialport
                             virtio_console_test = rw_blocking_mode
                         - rw_nonblocking_mode:
                             only Linux
@@ -68,6 +70,8 @@
                             only virtserialport
                             virtio_console_test = rw_nonblocking_mode
                         - basic_loopback:
+                            # loopback test between two ports
+                            no virtconsole
                             virtio_console_test = basic_loopback
                 - @with_vm:
                     # Works with virtconsole, but is not the comon usage, don't test by default
@@ -227,11 +231,15 @@
                         - boot_too_much_ports:
                             # arm doesn't use pci bus
                             no aarch64
-                            extra_params = " -device virtio-serial-pci,max_ports=32"
+                            # max_ports extended in rhev7: "rhev7,lower_version"
+                            max_ports_invalid = "512,32"
+                            max_ports_valid = "511,31"
+                            extra_params = " -device virtio-serial-pci,max_ports=%s"
                             start_vm = no
                             virtio_console_test = failed_boot
-                            virtio_console_params = "maximum ports supported: 31"
+                            virtio_console_params = "maximum ports supported: %s"
                             virtio_ports = ""
+                            qemu_version_pattern = "2\.\d+\.\d+"
     variants:
         # Use only single virtio-serial-pci
         - spread_linear: