virtinst: bhyve: configure nmdm console

Bhyve only supports nmdm console type, so use it instead of TYPE_PTY.

Reviewed-by: Cole Robinson <crobinso@redhat.com>
Signed-off-by: Roman Bogorodskiy <bogorodskiy@gmail.com>

tests/data/cli/compare/virt-install-bhyve-default-f27.xml

@@ -26,7 +26,9 @@
       <mac address="00:11:22:33:44:55"/>
       <model type="e1000"/>
     </interface>
-    <console type="pty"/>
+    <console type="nmdm">
+      <source master="/dev/nmdm00000000-1111-2222-3333-444444444444A" slave="/dev/nmdm00000000-1111-2222-3333-444444444444B"/>
+    </console>
     <input type="tablet" bus="usb"/>
     <graphics type="vnc" port="-1"/>
     <video>

virtinst/guest.py

@@ -844,7 +844,14 @@ class Guest(XMLBuilder):
             return
 
         dev = DeviceConsole(self.conn)
-        dev.type = dev.TYPE_PTY
+        if self.conn.is_bhyve():
+            nmdm_dev_prefix = '/dev/nmdm{}'.format(self.generate_uuid(self.conn))
+            dev.type = dev.TYPE_NMDM
+            dev.source.master = nmdm_dev_prefix + 'A'
+            dev.source.slave = nmdm_dev_prefix + 'B'
+        else:
+            dev.type = dev.TYPE_PTY
+
         if self.os.is_s390x():
             dev.target_type = "sclp"
         self.add_device(dev)