Add 'has_videocard' libvirt node attribute

- if 'has_videocard' == True, add <video> device to the
  libvirt node. Default: True

Allows to disable videocard for libvirt VMs if necessary

Change-Id: I7a14557016526b6fd1a49b8ef05fb7d111800503

devops/driver/libvirt/libvirt_driver.py

@@ -1081,6 +1081,7 @@ class LibvirtNode(node.Node):
     vcpu = base.ParamField(default=1)
     memory = base.ParamField(default=1024)
     has_vnc = base.ParamField(default=True)
+    has_videocard = base.ParamField(default=True)
     bootmenu_timeout = base.ParamField(default=0)
     numa = base.ParamField(default=[])
     cloud_init_volume_name = base.ParamField()
@@ -1221,6 +1222,7 @@ class LibvirtNode(node.Node):
             bootmenu_timeout=self.bootmenu_timeout,
             emulator=emulator,
             has_vnc=self.has_vnc,
+            has_videocard=self.has_videocard,
             vnc_password=self.driver.vnc_password,
             local_disk_devices=local_disk_devices,
             interfaces=local_interfaces,

devops/driver/libvirt/libvirt_xml_builder.py

@@ -240,8 +240,8 @@ class LibvirtXMLBuilder(object):
     def build_node_xml(cls, name, hypervisor, use_host_cpu, vcpu, memory,
                        use_hugepages, hpet, os_type, architecture, boot,
                        reboot_timeout, bootmenu_timeout, emulator,
-                       has_vnc, vnc_password, local_disk_devices, interfaces,
-                       acpi, numa):
+                       has_vnc, has_videocard, vnc_password,
+                       local_disk_devices, interfaces, acpi, numa):
         """Generate node XML
 
         :rtype : String
@@ -323,8 +323,9 @@ class LibvirtXMLBuilder(object):
                 cls._build_disk_device(node_xml, **disk_device)
             for interface in interfaces:
                 cls._build_interface_device(node_xml, **interface)
-            with node_xml.video:
-                node_xml.model(type='vga', vram='9216', heads='1')
+            if has_videocard:
+                with node_xml.video:
+                    node_xml.model(type='vga', vram='9216', heads='1')
             with node_xml.serial(type='pty'):
                 node_xml.target(port='0')
             with node_xml.console(type='pty'):

devops/tests/driver/libvirt/test_xml_builder.py

@@ -378,6 +378,7 @@ class TestNodeXml(BaseTestXMLBuilder):
             bootmenu_timeout=0,
             emulator='/usr/lib64/xen/bin/qemu-dm',
             has_vnc=True,
+            has_videocard=True,
             vnc_password='123456',
             local_disk_devices=[],
             interfaces=[],
@@ -442,6 +443,7 @@ class TestNodeXml(BaseTestXMLBuilder):
             bootmenu_timeout=3000,
             emulator='/usr/lib64/xen/bin/qemu-dm',
             has_vnc=True,
+            has_videocard=False,
             vnc_password=None,
             local_disk_devices=self.disk_devices,
             interfaces=self.interfaces,
@@ -508,9 +510,6 @@ class TestNodeXml(BaseTestXMLBuilder):
             <model type="pcnet"/>
             <filterref filter="test_filter2"/>
         </interface>
-        <video>
-            <model heads="1" type="vga" vram="9216"/>
-        </video>
         <serial type="pty">
             <target port="0"/>
         </serial>
@@ -537,6 +536,7 @@ class TestNodeXml(BaseTestXMLBuilder):
             bootmenu_timeout=3000,
             emulator='/usr/lib64/xen/bin/qemu-dm',
             has_vnc=True,
+            has_videocard=True,
             vnc_password=None,
             local_disk_devices=[],
             interfaces=[],