conf: Add invalid secrettype checks

Add a couple of tests to "validate" checks in domain_conf that either
a missing secrettype (CONFIG_UNSUPPORTED) or an mismatched secrettype
of ceph for an iSCSI disk (INTERNAL_ERROR) will cause a parsing error.

tests/qemuxml2argvdata/qemuxml2argv-disk-drive-network-iscsi-auth-secrettype-invalid.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'>1</vcpu>
+  <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>
+    <disk type='network' device='disk'>
+      <driver name='qemu' type='raw'/>
+      <auth username='myname'>
+        <secret usage='mycluster_myname'/>
+      </auth>
+      <source protocol='iscsi' name='iqn.1992-01.com.example:storage/1'>
+        <host name='example.org' port='6000'/>
+      </source>
+      <target dev='vda' bus='virtio'/>
+    </disk>
+    <controller type='usb' index='0'/>
+    <controller type='pci' index='0' model='pci-root'/>
+    <input type='mouse' bus='ps2'/>
+    <input type='keyboard' bus='ps2'/>
+    <memballoon model='none'/>
+  </devices>
+</domain>

tests/qemuxml2argvdata/qemuxml2argv-disk-drive-network-iscsi-auth-wrong-secrettype.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'>1</vcpu>
+  <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>
+    <disk type='network' device='disk'>
+      <driver name='qemu' type='raw'/>
+      <auth username='myname'>
+        <secret type='ceph' usage='mycluster_myname'/>
+      </auth>
+      <source protocol='iscsi' name='iqn.1992-01.com.example:storage/1'>
+        <host name='example.org' port='6000'/>
+      </source>
+      <target dev='vda' bus='virtio'/>
+    </disk>
+    <controller type='usb' index='0'/>
+    <controller type='pci' index='0' model='pci-root'/>
+    <input type='mouse' bus='ps2'/>
+    <input type='keyboard' bus='ps2'/>
+    <memballoon model='none'/>
+  </devices>
+</domain>

tests/qemuxml2argvtest.c

@@ -917,6 +917,8 @@ mymain(void)
     DO_TEST("disk-drive-network-nbd-unix", NONE);
     DO_TEST("disk-drive-network-iscsi", NONE);
     DO_TEST("disk-drive-network-iscsi-auth", NONE);
+    DO_TEST_PARSE_ERROR("disk-drive-network-iscsi-auth-secrettype-invalid", NONE);
+    DO_TEST_PARSE_ERROR("disk-drive-network-iscsi-auth-wrong-secrettype", NONE);
     DO_TEST("disk-drive-network-iscsi-lun",
             QEMU_CAPS_NODEFCONFIG, QEMU_CAPS_VIRTIO_SCSI,
             QEMU_CAPS_SCSI_BLOCK);