Update the message logged on relays when DirCache is disabled

Since 0.3.3.5-rc, authorities require DirCache (V2Dir) for the Guard
flag.

Fixes bug 24312; bugfix on 0.3.3.5-rc.

changes/bug24312

@@ -0,0 +1,4 @@
+  o Minor bugfixes (relays):
+    - Since 0.3.3.5-rc, authorities require DirCache (V2Dir) for the Guard
+      flag. Update the message logged on relays when DirCache is disabled.
+      Fixes bug 24312; bugfix on 0.3.3.5-rc.

src/app/config/config.c

@@ -4714,7 +4714,7 @@ have_enough_mem_for_dircache(const or_options_t *options, size_t total_mem,
   } else {
     if (total_mem >= DIRCACHE_MIN_MEM_BYTES) {
       *msg = tor_strdup("DirCache is disabled and we are configured as a "
-               "relay. Many client versions will not choose us as a guard. ");
+               "relay. We will not become a Guard.");
     }
   }
   return *msg == NULL ? 0 : -1;