Supporting UNIX sockets in address matching.

This closes #645 issue on GitHub.

(Also moved a changelog line that was misplaced in a previous commit.)

src/nxt_http_route.c

@@ -1818,6 +1818,13 @@ nxt_http_route_addr_pattern_match(nxt_http_route_addr_pattern_t *p,
         break;
 #endif
 
+#if (NXT_HAVE_UNIX_DOMAIN)
+    case AF_UNIX:
+
+        match = (base->addr_family == AF_UNIX);
+        break;
+#endif
+
     default:
         match = 0;
         break;