util: storage: make virStorageSourceParseBackingJSONGlusterHost universal

The same json strucutre is used for NBD and sheepdog volumes for
specifying of the host. Rename the function and fix up error messages to
be more universal.

src/util/virstoragefile.c

@@ -2795,8 +2795,8 @@ virStorageSourceParseBackingJSONUri(virStorageSourcePtr src,
 
 
 static int
-virStorageSourceParseBackingJSONGlusterHost(virStorageNetHostDefPtr host,
-                                            virJSONValuePtr json)
+virStorageSourceParseBackingJSONSocketAddress(virStorageNetHostDefPtr host,
+                                              virJSONValuePtr json)
 {
     const char *type = virJSONValueObjectGetString(json, "type");
     const char *hostname = virJSONValueObjectGetString(json, "host");
@@ -2817,7 +2817,7 @@ virStorageSourceParseBackingJSONGlusterHost(virStorageNetHostDefPtr host,
         if (!hostname) {
             virReportError(VIR_ERR_INVALID_ARG, "%s",
                            _("missing hostname for tcp backing server in "
-                             "JSON backing definition for gluster volume"));
+                             "JSON backing volume definition"));
             return -1;
         }
 
@@ -2830,7 +2830,7 @@ virStorageSourceParseBackingJSONGlusterHost(virStorageNetHostDefPtr host,
         if (!socket) {
             virReportError(VIR_ERR_INVALID_ARG, "%s",
                            _("missing socket path for udp backing server in "
-                             "JSON backing definition for gluster volume"));
+                             "JSON backing volume definition"));
             return -1;
         }
 
@@ -2897,8 +2897,8 @@ virStorageSourceParseBackingJSONGluster(virStorageSourcePtr src,
     src->nhosts = nservers;
 
     for (i = 0; i < nservers; i++) {
-        if (virStorageSourceParseBackingJSONGlusterHost(src->hosts + i,
-                                                        virJSONValueArrayGet(server, i)) < 0)
+        if (virStorageSourceParseBackingJSONSocketAddress(src->hosts + i,
+                                                          virJSONValueArrayGet(server, i)) < 0)
             return -1;
     }