qemu: remove use of the terms 'master' and 'slave' when iterating CPUs

When querying QEMU we have to iterate over two nested sets
of CPUs. The terms "main vcpu" and "sub vcpu" are a good
representation.
Reviewed-by: NPeter Krempa <pkrempa@redhat.com>
Signed-off-by: NDaniel P. Berrangé <berrange@redhat.com>

src/qemu/qemu_monitor.c

@@ -1734,8 +1734,8 @@ qemuMonitorGetCPUInfoHotplug(struct qemuMonitorQueryHotpluggableCpusEntry *hotpl
     char *tmp;
     int order = 1;
     size_t totalvcpus = 0;
-    size_t mastervcpu; /* this iterator is used for iterating hotpluggable entities */
-    size_t slavevcpu; /* this corresponds to subentries of a hotpluggable entry */
+    size_t mainvcpu; /* this iterator is used for iterating hotpluggable entities */
+    size_t subvcpu; /* this corresponds to subentries of a hotpluggable entry */
     size_t anyvcpu; /* this iterator is used for any vcpu entry in the result */
     size_t i;
     size_t j;
@@ -1777,31 +1777,31 @@ qemuMonitorGetCPUInfoHotplug(struct qemuMonitorQueryHotpluggableCpusEntry *hotpl
     /* transfer appropriate data from the hotpluggable list to corresponding
      * entries. the entries returned by qemu may in fact describe multiple
      * logical vcpus in the guest */
-    mastervcpu = 0;
+    mainvcpu = 0;
     for (i = 0; i < nhotplugvcpus; i++) {
-        vcpus[mastervcpu].online = !!hotplugvcpus[i].qom_path;
-        vcpus[mastervcpu].hotpluggable = !!hotplugvcpus[i].alias ||
-                                         !vcpus[mastervcpu].online;
-        vcpus[mastervcpu].socket_id = hotplugvcpus[i].socket_id;
-        vcpus[mastervcpu].die_id = hotplugvcpus[i].die_id;
-        vcpus[mastervcpu].core_id = hotplugvcpus[i].core_id;
-        vcpus[mastervcpu].thread_id = hotplugvcpus[i].thread_id;
-        vcpus[mastervcpu].node_id = hotplugvcpus[i].node_id;
-        vcpus[mastervcpu].vcpus = hotplugvcpus[i].vcpus;
-        vcpus[mastervcpu].qom_path = g_steal_pointer(&hotplugvcpus[i].qom_path);
-        vcpus[mastervcpu].alias = g_steal_pointer(&hotplugvcpus[i].alias);
-        vcpus[mastervcpu].type = g_steal_pointer(&hotplugvcpus[i].type);
-        vcpus[mastervcpu].props = g_steal_pointer(&hotplugvcpus[i].props);
-        vcpus[mastervcpu].id = hotplugvcpus[i].enable_id;
-
-        /* copy state information to slave vcpus */
-        for (slavevcpu = mastervcpu + 1; slavevcpu < mastervcpu + hotplugvcpus[i].vcpus; slavevcpu++) {
-            vcpus[slavevcpu].online = vcpus[mastervcpu].online;
-            vcpus[slavevcpu].hotpluggable = vcpus[mastervcpu].hotpluggable;
+        vcpus[mainvcpu].online = !!hotplugvcpus[i].qom_path;
+        vcpus[mainvcpu].hotpluggable = !!hotplugvcpus[i].alias ||
+                                         !vcpus[mainvcpu].online;
+        vcpus[mainvcpu].socket_id = hotplugvcpus[i].socket_id;
+        vcpus[mainvcpu].die_id = hotplugvcpus[i].die_id;
+        vcpus[mainvcpu].core_id = hotplugvcpus[i].core_id;
+        vcpus[mainvcpu].thread_id = hotplugvcpus[i].thread_id;
+        vcpus[mainvcpu].node_id = hotplugvcpus[i].node_id;
+        vcpus[mainvcpu].vcpus = hotplugvcpus[i].vcpus;
+        vcpus[mainvcpu].qom_path = g_steal_pointer(&hotplugvcpus[i].qom_path);
+        vcpus[mainvcpu].alias = g_steal_pointer(&hotplugvcpus[i].alias);
+        vcpus[mainvcpu].type = g_steal_pointer(&hotplugvcpus[i].type);
+        vcpus[mainvcpu].props = g_steal_pointer(&hotplugvcpus[i].props);
+        vcpus[mainvcpu].id = hotplugvcpus[i].enable_id;
+
+        /* copy state information to sub vcpus */
+        for (subvcpu = mainvcpu + 1; subvcpu < mainvcpu + hotplugvcpus[i].vcpus; subvcpu++) {
+            vcpus[subvcpu].online = vcpus[mainvcpu].online;
+            vcpus[subvcpu].hotpluggable = vcpus[mainvcpu].hotpluggable;
         }
 
         /* calculate next master vcpu (hotpluggable unit) entry */
-        mastervcpu += hotplugvcpus[i].vcpus;
+        mainvcpu += hotplugvcpus[i].vcpus;
     }
 
     /* match entries from query cpus to the output array taking into account