xenconfig: set HVM pae/apic/acpi/ default to 1

According to xm.config manual, HVM pae|apic|acpi feature default
is 1 (enabled). But in conversion from xm config to libvirt xml,
if xm config doesn't contain pae|apic|acpi, it sets default value
to 0, this causes some problems in HVM guest.

Update parser codes to set HVM pae|apic|acpi default value to 1
to match xm config convension.
Signed-off-by: NChunyan Liu <cyliu@suse.com>

src/xenconfig/xen_common.c

@@ -512,17 +512,17 @@ xenParseCPUFeatures(virConfPtr conf, virDomainDefPtr def)
         return -1;
 
     if (STREQ(def->os.type, "hvm")) {
-        if (xenConfigGetBool(conf, "pae", &val, 0) < 0)
+        if (xenConfigGetBool(conf, "pae", &val, 1) < 0)
             return -1;
 
         else if (val)
             def->features[VIR_DOMAIN_FEATURE_PAE] = VIR_TRISTATE_SWITCH_ON;
-        if (xenConfigGetBool(conf, "acpi", &val, 0) < 0)
+        if (xenConfigGetBool(conf, "acpi", &val, 1) < 0)
             return -1;
 
         else if (val)
             def->features[VIR_DOMAIN_FEATURE_ACPI] = VIR_TRISTATE_SWITCH_ON;
-        if (xenConfigGetBool(conf, "apic", &val, 0) < 0)
+        if (xenConfigGetBool(conf, "apic", &val, 1) < 0)
             return -1;
 
         else if (val)