Revert "util: support setting peer for virNetDevIPInfo addresses"

This reverts commit cb20f989.

This feature was accidentally pushed in the feature freeze.

src/util/virnetdevip.c

@@ -919,7 +919,7 @@ virNetDevIPInfoAddToDev(const char *ifname,
                            ipStr);
             goto cleanup;
         }
-        if (virNetDevIPAddrAdd(ifname, &ip->address, &ip->peer, prefix) < 0)
+        if (virNetDevIPAddrAdd(ifname, &ip->address, NULL, prefix) < 0)
             goto cleanup;
         VIR_FREE(ipStr);
     }