Make domain save work when dynamic_ownership=0

Setting dynamic_ownership=0 in /etc/libvirt/qemu.conf prevents
libvirt's DAC security driver from setting uid/gid on disk
files when starting/stopping QEMU, allowing the admin to manage
this manually. As a side effect it also stopped setting of
uid/gid when saving guests to a file, which completely breaks
save when QEMU is running non-root. Thus saved state labelling
code must ignore the dynamic_ownership parameter

* src/qemu/qemu_security_dac.c: Ignore dynamic_ownership=0 when
  doing save/restore image labelling

src/qemu/qemu_security_dac.c

@@ -407,7 +407,7 @@ static int
 qemuSecurityDACSetSavedStateLabel(virDomainObjPtr vm ATTRIBUTE_UNUSED,
                                   const char *savefile)
 {
-    if (!driver->privileged || !driver->dynamicOwnership)
+    if (!driver->privileged)
         return 0;
 
     return qemuSecurityDACSetOwnership(savefile, driver->user, driver->group);
@@ -418,7 +418,7 @@ static int
 qemuSecurityDACRestoreSavedStateLabel(virDomainObjPtr vm ATTRIBUTE_UNUSED,
                                       const char *savefile)
 {
-    if (!driver->privileged || !driver->dynamicOwnership)
+    if (!driver->privileged)
         return 0;
 
     return qemuSecurityDACRestoreSecurityFileLabel(savefile);