RNG schema: allow plain @floor to <bandwidth/>

The <inbound/> element to <bandwidth/> has several attributes from
which two are mandatory. Well, from two at least one has to be
present: @average or @floor or both. Instead of inventing crazy RNG
schema, let's make all the attributes optional there and rely on our
parsing code to correctly handle the situation.
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>

docs/schemas/networkcommon.rng

@@ -152,9 +152,11 @@
   </define>
 
   <define name="bandwidth-attributes">
-    <attribute name="average">
-      <ref name="speed"/>
-    </attribute>
+    <optional>
+      <attribute name="average">
+        <ref name="speed"/>
+      </attribute>
+    </optional>
     <optional>
       <attribute name="peak">
         <ref name="speed"/>

tests/qemuxml2argvdata/qemuxml2argv-net-bandwidth2.xml

+<domain type='kvm'>
+  <name>f14-60</name>
+  <uuid>38644c45-5227-a936-3b38-bc4f72c355bb</uuid>
+  <memory unit='KiB'>1048576</memory>
+  <currentMemory unit='KiB'>1048576</currentMemory>
+  <vcpu placement='static'>2</vcpu>
+  <os>
+    <type arch='x86_64' machine='pc-0.13'>hvm</type>
+    <boot dev='cdrom'/>
+    <boot dev='hd'/>
+    <bootmenu enable='yes'/>
+  </os>
+  <features>
+    <acpi/>
+    <apic/>
+    <pae/>
+  </features>
+  <clock offset='utc'/>
+  <on_poweroff>destroy</on_poweroff>
+  <on_reboot>restart</on_reboot>
+  <on_crash>restart</on_crash>
+  <devices>
+    <emulator>/usr/bin/qemu-kvm</emulator>
+    <disk type='file' device='disk'>
+      <driver name='qemu' type='qcow2'/>
+      <source file='/var/lib/libvirt/images/f14-6.img'/>
+      <target dev='vda' bus='virtio'/>
+      <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>
+    </disk>
+    <controller type='usb' index='0'/>
+    <controller type='virtio-serial' index='0'>
+      <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/>
+    </controller>
+    <controller type='pci' index='0' model='pci-root'/>
+    <interface type='network'>
+      <mac address='52:54:00:24:a5:9f'/>
+      <source network='default'/>
+      <bandwidth>
+        <inbound floor='200'/>
+      </bandwidth>
+      <model type='rtl8139'/>
+      <address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x0'/>
+    </interface>
+    <serial type='pty'>
+      <target port='0'/>
+    </serial>
+    <console type='pty'>
+      <target type='serial' port='0'/>
+    </console>
+    <input type='tablet' bus='usb'/>
+    <input type='mouse' bus='ps2'/>
+    <input type='keyboard' bus='ps2'/>
+    <graphics type='vnc' port='-1' autoport='yes'/>
+    <sound model='ac97'>
+      <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
+    </sound>
+    <video>
+      <model type='vga' vram='16384' heads='1'/>
+      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
+    </video>
+    <memballoon model='virtio'>
+      <address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/>
+    </memballoon>
+  </devices>
+</domain>

tests/qemuxml2xmltest.c

@@ -456,6 +456,7 @@ mymain(void)
     DO_TEST("sound");
     DO_TEST("sound-device");
     DO_TEST("net-bandwidth");
+    DO_TEST("net-bandwidth2");
 
     DO_TEST("serial-vc");
     DO_TEST("serial-pty");