qemu: Fix pit timer tick policy=delay

By a mistake, for the VIR_DOMAIN_TIMER_TICKPOLICY_DELAY qemu
command line creation, 'discard' was used instead of 'delay'
in commit id '1569fa14'.

Test "kvm-pit-delay" is fixed accordingly to show the correct
option being generated.

Remove the (now) redundant kvm-pit-device tests. As it turns
out there is no need to specify both QEMU_CAPS_NO_KVM_PIT and
QEMU_CAPS_KVM_PIT_TICK_POLICY since they are mutually exclusive
and "kvm-pit-device" becomes just the same as "kvm-pit-delay".
Signed-off-by: NMaxim Nestratov <mnestratov@virtuozzo.com>

src/qemu/qemu_command.c

@@ -6242,7 +6242,7 @@ qemuBuildClockCommandLine(virCommandPtr cmd,
                    (-no-kvm-pit), otherwise, the default is catchup. */
                 if (virQEMUCapsGet(qemuCaps, QEMU_CAPS_KVM_PIT_TICK_POLICY))
                     virCommandAddArgList(cmd, "-global",
-                                         "kvm-pit.lost_tick_policy=discard", NULL);
+                                         "kvm-pit.lost_tick_policy=delay", NULL);
                 else if (virQEMUCapsGet(qemuCaps, QEMU_CAPS_NO_KVM_PIT))
                     virCommandAddArg(cmd, "-no-kvm-pit-reinjection");
                 break;

tests/qemuxml2argvdata/qemuxml2argv-kvm-pit-delay.args

@@ -14,7 +14,7 @@ QEMU_AUDIO_DRV=none \
 -nographic \
 -nodefaults \
 -monitor unix:/tmp/lib/domain--1-QEMUGuest1/monitor.sock,server,nowait \
--no-kvm-pit-reinjection \
+-global kvm-pit.lost_tick_policy=delay \
 -no-acpi \
 -boot c \
 -usb \

tests/qemuxml2argvtest.c

@@ -2274,10 +2274,7 @@ mymain(void)
             QEMU_CAPS_KVM);
     qemuTestSetHostArch(driver.caps, VIR_ARCH_NONE);
 
-    DO_TEST("kvm-pit-device", QEMU_CAPS_KVM_PIT_TICK_POLICY);
-    DO_TEST("kvm-pit-delay", QEMU_CAPS_NO_KVM_PIT);
-    DO_TEST("kvm-pit-device", QEMU_CAPS_NO_KVM_PIT,
-            QEMU_CAPS_KVM_PIT_TICK_POLICY);
+    DO_TEST("kvm-pit-delay", QEMU_CAPS_KVM_PIT_TICK_POLICY);
 
     DO_TEST("panic", QEMU_CAPS_DEVICE_PANIC,
             QEMU_CAPS_NODEFCONFIG);