guest: Fix multiple address.type=pci auto allocate requests

And test it for aarch64, which is the only place it's really
interesting at the moment

tests/cli-test-xml/compare/virt-install-aarch64-kvm-gic.xml

@@ -19,10 +19,19 @@
   <on_crash>restart</on_crash>
   <devices>
     <emulator>/usr/bin/qemu-system-aarch64</emulator>
-    <interface type="bridge">
-      <source bridge="eth0"/>
+    <disk type="file" device="disk">
+      <driver name="qemu" type="qcow2"/>
+      <source file="/var/lib/libvirt/images/foobar.qcow2"/>
+      <target dev="sda" bus="scsi"/>
+    </disk>
+    <controller type="scsi" index="0" model="virtio-scsi">
+      <address type="pci"/>
+    </controller>
+    <interface type="network">
+      <source network="default"/>
       <mac address="00:11:22:33:44:55"/>
       <model type="virtio"/>
+      <address type="pci"/>
     </interface>
     <console type="pty"/>
     <channel type="unix">

tests/clitest.py

@@ -714,7 +714,7 @@ c.add_compare("--arch aarch64 --machine virt --boot kernel=/f19-arm.kernel,initr
 c.add_compare("--arch aarch64 --boot kernel=/f19-arm.kernel,initrd=/f19-arm.initrd,kernel_args=\"console=ttyAMA0,1234 rw root=/dev/vda3\" --disk %(EXISTIMG1)s", "aarch64-machdefault")
 c.add_compare("--arch aarch64 --cdrom %(EXISTIMG2)s --boot loader=CODE.fd,nvram_template=VARS.fd --disk %(EXISTIMG1)s --cpu none --events on_crash=preserve,on_reboot=destroy,on_poweroff=restart", "aarch64-cdrom")
 c.add_compare("--connect %(URI-KVM-AARCH64)s --disk %(EXISTIMG1)s --import --os-variant fedora21", "aarch64-kvm-import")
-c.add_compare("--connect %(URI-KVM-AARCH64)s --disk none --os-variant fedora22 --features gic_version=host", "aarch64-kvm-gic")
+c.add_compare("--connect %(URI-KVM-AARCH64)s --disk size=1 --os-variant fedora22 --features gic_version=host --network network=default,address.type=pci --controller type=scsi,model=virtio-scsi,address.type=pci", "aarch64-kvm-gic")
 
 # ppc64 tests
 c.add_compare("--arch ppc64 --machine pseries --boot network --disk %(EXISTIMG1)s --disk device=cdrom --os-variant fedora20 --network none", "ppc64-pseries-f20")

virtinst/guest.py

@@ -914,6 +914,8 @@ class Guest(XMLBuilder):
         for d in self.get_all_devices():
             if d.address.type != d.address.ADDRESS_TYPE_PCI:
                 continue
+            if None in [d.address.domain, d.address.bus, d.address.slot]:
+                continue
 
             addr = d.address
             addrstr = "%d%d%d" % (d.address.domain,