vswitchd: Make names of Interface external_ids generic.

Until now the names of the external_ids keys used for Interface records
have implied that they are specific to XenServer, because they begin with
"xs-".  They are more generic in intent, however, so this commit removes
the "xs-" prefix and explains them more generically.

The Bridge record's external_ids still need renaming.

vswitchd/vswitch.xml

@@ -383,21 +383,29 @@
 
     <group title="Other Features">
       <column name="external_ids">
-        Key-value pairs that identify this interface's role in external
+        <p>Key-value pairs that identify this interface's role in external
-        systems.  The currently defined key-value pairs are:
+          systems.  All of the currently defined key-value pairs specifically
+          apply to an interface that represents a virtual Ethernet interface
+          connected to a virtual machine.  These key-value pairs should not be
+          present for other types of interfaces.  Keys whose names end
+          in <code>-uuid</code> have values that uniquely identify the entity
+          in question.  For a Citrix XenServer hypervisor, these values are
+          UUIDs in RFC 4122 format.  Other hypervisors may use other
+          formats.</p>
+        <p>The currently defined key-value pairs are:</p>
         <dl>
-          <dt><code>xs-vif-uuid</code></dt>
+          <dt><code>vif-uuid</code></dt>
-          <dd>UUID of the Citrix XenServer VIF associated with this
+          <dd>The virtual interface associated with this interface.</dd>
-            interface.</dd>
+          <dt><code>network-uuid</code></dt>
-          <dt><code>xs-network-uuid</code></dt>
+          <dd>The virtual network to which this interface is attached.</dd>
-          <dd>UUID of the Citrix XenServer network to which this interface is
+          <dt><code>vm-uuid</code></dt>
-            attached.</dd>
+          <dd>The VM to which this interface belongs.</dd>
-          <dt><code>xs-vif-vm-uuid</code></dt>
+          <dt><code>vif-mac</code></dt>
-          <dd>UUID of the Citrix XenServer VM to which this interface
+          <dd>The MAC address programmed into the "virtual hardware" for this
-            belongs.</dd>
+              interface, in the
-          <dt><code>xs-vif-mac</code></dt>
+              form <var>xx</var>:<var>xx</var>:<var>xx</var>:<var>xx</var>:<var>xx</var>:<var>xx</var>.
-          <dd>The value of the "MAC" field in the Citrix XenServer VIF record
+              For Citrix XenServer, this is the value of the <code>MAC</code>
-            for this interface.</dd>
+              field in the VIF record for this interface.</dd>
         </dl>
       </column>
     </group>

xenserver/etc_xensource_scripts_vif

@@ -92,7 +92,7 @@ handle_vswitch_vif_details()
 	local vm_uuid=$(xenstore-read "$vm/uuid" 2>/dev/null)
     fi
     if [ -n "${vm_uuid}" ] ; then
-	set_vif_external_id "xs-vm-uuid" "${vm_uuid}"
+	set_vif_external_id "vm-uuid" "${vm_uuid}"
     fi
 
     local vif_uuid=$(xenstore-read "${PRIVATE}/vif-uuid" 2>/dev/null)
@@ -100,7 +100,7 @@ handle_vswitch_vif_details()
         vif_uuid=$(xe vif-list --minimal vm-uuid="${vm_uuid}" device=$DEVID)
     fi
     if [ -n "${vif_uuid}" ] ; then
-	set_vif_external_id "xs-vif-uuid" "${vif_uuid}"
+	set_vif_external_id "vif-uuid" "${vif_uuid}"
     fi
 
     local vif_details=
@@ -109,12 +109,12 @@ handle_vswitch_vif_details()
         net_uuid=$(xe vif-param-get uuid="${vif_uuid}" param-name=network-uuid)
     fi
     if [ -n "${net_uuid}" ] ; then
-	set_vif_external_id "xs-network-uuid" "${net_uuid}"
+	set_vif_external_id "network-uuid" "${net_uuid}"
     fi
 
     local address=$(xenstore-read "/local/domain/$DOMID/device/vif/$DEVID/mac" 2>/dev/null)
     if [ -n "${address}" ] ; then
-	set_vif_external_id "xs-vif-mac" "${address}"
+	set_vif_external_id "vif-mac" "${address}"
     fi
 }