conf: add <acpi><table> to <os>

Add a new element to <domain> XML:
<os>
  <acpi>
    <table type="slic">/path/to/acpi/table/file</table>
  </acpi>
</os>

To supply a path to a SLIC (Software Licensing) ACPI
table blob.

https://bugzilla.redhat.com/show_bug.cgi?id=1327537

docs/formatdomain.html.in

@@ -277,6 +277,9 @@
     <initrd>/root/f8-i386-initrd</initrd>
     <cmdline>console=ttyS0 ks=http://example.com/f8-i386/os/</cmdline>
     <dtb>/root/ppc.dtb</dtb>
+    <acpi>
+      <table type='slic'>/path/to/slic.dat</table>
+    </acpi>
   </os>
   ...</pre>
 
@@ -302,6 +305,11 @@
       <dd>The contents of this element specify the fully-qualified path
         to the (optional) device tree binary (dtb) image in the host OS.
         <span class="since">Since 1.0.4</span></dd>
+      <dt><code>acpi</code></dt>
+      <dd>The <code>table</code> element contains a fully-qualified path
+        to the ACPI table. The <code>type</code> attribute contains the
+        ACPI table type (currently only <code>slic</code> is supported)
+        <span class="since">Since 1.3.5 (QEMU only)</span></dd>
     </dl>
 
     <h4><a name="elementsOSContainer">Container boot</a></h4>

docs/schemas/domaincommon.rng

@@ -306,6 +306,9 @@
         <optional>
           <ref name="bios"/>
         </optional>
+        <optional>
+          <ref name="acpiTable"/>
+        </optional>
       </interleave>
     </element>
   </define>
@@ -4505,6 +4508,21 @@
     </data>
   </define>
 
+  <define name="acpiTable">
+    <element name="acpi">
+      <zeroOrMore>
+        <element name="table">
+          <attribute name="type">
+            <choice>
+              <value>slic</value>
+            </choice>
+          </attribute>
+          <ref name="absFilePath"/>
+        </element>
+      </zeroOrMore>
+    </element>
+  </define>
+
   <define name="smbios">
     <element name="smbios">
       <attribute name="mode">