tests: domaincapstest: Fix after iothreads addition

Introduced in 8525b969. Some files weren't updated. I'm just
guessing on the bhyve ones
Signed-off-by: NCole Robinson <crobinso@redhat.com>

tests/domaincapsschemadata/bhyve_basic.x86_64.xml

@@ -2,6 +2,7 @@
   <path>/usr/sbin/bhyve</path>
   <domain>bhyve</domain>
   <arch>x86_64</arch>
+  <iothreads supported='no'/>
   <os supported='yes'>
     <loader supported='no'/>
   </os>

tests/domaincapsschemadata/bhyve_fbuf.x86_64.xml

@@ -2,6 +2,7 @@
   <path>/usr/sbin/bhyve</path>
   <domain>bhyve</domain>
   <arch>x86_64</arch>
+  <iothreads supported='no'/>
   <os supported='yes'>
     <loader supported='yes'>
       <value>/foo/bar</value>

tests/domaincapsschemadata/bhyve_uefi.x86_64.xml

@@ -2,6 +2,7 @@
   <path>/usr/sbin/bhyve</path>
   <domain>bhyve</domain>
   <arch>x86_64</arch>
+  <iothreads supported='no'/>
   <os supported='yes'>
     <loader supported='yes'>
       <value>/foo/bar</value>

tests/domaincapsschemadata/libxl-xenfv-usb.xml

@@ -4,6 +4,7 @@
   <machine>xenfv</machine>
   <arch>x86_64</arch>
   <vcpu max='128'/>
+  <iothreads supported='no'/>
   <os supported='yes'>
     <loader supported='yes'>
       <value>/usr/lib/xen/boot/hvmloader</value>

tests/domaincapsschemadata/libxl-xenpv-usb.xml

@@ -4,6 +4,7 @@
   <machine>xenpv</machine>
   <arch>x86_64</arch>
   <vcpu max='512'/>
+  <iothreads supported='no'/>
   <os supported='yes'>
     <loader supported='no'/>
   </os>