tests: Add test for properly removing cachetune entries

Cachetune for unavailable vCPUs should be cleared the same way vcpupin and other
things do, so let's add tests for it.
Signed-off-by: NMartin Kletzander <mkletzan@redhat.com>

tests/genericxml2xmlindata/cachetune-extra-tunes.xml

+<domain type='qemu'>
+  <name>QEMUGuest1</name>
+  <uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid>
+  <memory unit='KiB'>219136</memory>
+  <currentMemory unit='KiB'>219136</currentMemory>
+  <vcpu placement='static'>2</vcpu>
+  <cputune>
+    <cachetune vcpus='0-3'>
+      <cache id='0' level='3' type='code' size='7680' unit='KiB'/>
+      <cache id='1' level='3' type='data' size='3840' unit='KiB'/>
+    </cachetune>
+    <cachetune vcpus='100'>
+      <cache id='1' level='3' type='code' size='6' unit='MiB'/>
+    </cachetune>
+  </cputune>
+  <os>
+    <type arch='i686' machine='pc'>hvm</type>
+    <boot dev='hd'/>
+  </os>
+  <clock offset='utc'/>
+  <on_poweroff>destroy</on_poweroff>
+  <on_reboot>restart</on_reboot>
+  <on_crash>destroy</on_crash>
+  <devices>
+    <emulator>/usr/bin/qemu-system-i686</emulator>
+    <controller type='usb' index='0'/>
+    <controller type='ide' index='0'/>
+    <controller type='pci' index='0' model='pci-root'/>
+    <input type='mouse' bus='ps2'/>
+    <input type='keyboard' bus='ps2'/>
+    <memballoon model='virtio'/>
+  </devices>
+</domain>

tests/genericxml2xmloutdata/cachetune-extra-tunes.xml

+<domain type='qemu'>
+  <name>QEMUGuest1</name>
+  <uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid>
+  <memory unit='KiB'>219136</memory>
+  <currentMemory unit='KiB'>219136</currentMemory>
+  <vcpu placement='static'>2</vcpu>
+  <cputune>
+    <cachetune vcpus='0-1'>
+      <cache id='0' level='3' type='code' size='7680' unit='KiB'/>
+      <cache id='1' level='3' type='data' size='3840' unit='KiB'/>
+    </cachetune>
+  </cputune>
+  <os>
+    <type arch='i686' machine='pc'>hvm</type>
+    <boot dev='hd'/>
+  </os>
+  <clock offset='utc'/>
+  <on_poweroff>destroy</on_poweroff>
+  <on_reboot>restart</on_reboot>
+  <on_crash>destroy</on_crash>
+  <devices>
+    <emulator>/usr/bin/qemu-system-i686</emulator>
+    <controller type='usb' index='0'/>
+    <controller type='ide' index='0'/>
+    <controller type='pci' index='0' model='pci-root'/>
+    <input type='mouse' bus='ps2'/>
+    <input type='keyboard' bus='ps2'/>
+    <memballoon model='virtio'/>
+  </devices>
+</domain>

tests/genericxml2xmltest.c

@@ -133,6 +133,7 @@ mymain(void)
     DO_TEST("cachetune");
     DO_TEST("cachetune-small");
     DO_TEST("cachetune-cdp");
+    DO_TEST_DIFFERENT("cachetune-extra-tunes");
     DO_TEST_FULL("cachetune-colliding-allocs", false, true,
                  TEST_COMPARE_DOM_XML2XML_RESULT_FAIL_PARSE);
     DO_TEST_FULL("cachetune-colliding-tunes", false, true,