virerror: Introduce new error type NO_SERVER

This serves the same purpose as VIR_ERR_NO_xxx where xxx is any object
that API can be called upon.  Only this particular one is used for
daemon's servers.
Signed-off-by: NMartin Kletzander <mkletzan@redhat.com>

include/libvirt/virterror.h

@@ -311,6 +311,7 @@ typedef enum {
     VIR_ERR_XML_INVALID_SCHEMA = 92,    /* XML document doesn't validate against schema */
     VIR_ERR_MIGRATE_FINISH_OK = 93,     /* Finish API succeeded but it is expected to return NULL */
     VIR_ERR_AUTH_UNAVAILABLE = 94,	/* authentication unavailable */
+    VIR_ERR_NO_SERVER = 95,             /* Server was not found */
 } virErrorNumber;
 
 /**

src/util/virerror.c

@@ -1380,6 +1380,12 @@ virErrorMsg(virErrorNumber error, const char *info)
         case VIR_ERR_MIGRATE_FINISH_OK:
             errmsg = _("migration successfully aborted");
             break;
+        case VIR_ERR_NO_SERVER:
+            if (info == NULL)
+                errmsg = _("Server not found");
+            else
+                errmsg = _("Server not found: %s");
+            break;
     }
     return errmsg;
 }