qemu..smbios_table: Avoid using isapc/xenpv/xenfv machine types

The isapc/xenpv/xenfv machine types are not really supported by
Avocado-vt and without special configuration fail to boot. Let's mask
them here.

Note: The isapc is partially supported by Avocado-vt, but requires very
basic machine without additional devices, which does not suit this test.
Signed-off-by: NLukáš Doktor <ldoktor@redhat.com>

qemu/tests/smbios_table.py

@@ -66,6 +66,8 @@ def run(test, params, env):
 
     failures = []
     for m_type in support_machine_types:
+        if m_type in ("isapc", "xenfv", "xenpv"):
+            continue
         params["machine_type"] = m_type
         params["start_vm"] = "yes"