Avoid failing on auth for unconfigured replsets

All errors not related to authentication mean that auth is not required.

Author: stevenpost

templates/mongoshrc.js.erb

@@ -24,10 +24,7 @@ function authRequired() {
     if (err.message.match(/requires authentication/) || err.message.match(/not authorized on admin/)) {
       return true
     }
-    if (err.message.match(/not running with --replSet/)) {
-      return false
-    }
-    throw("Unknown error: " + err)
+    return false
   }
 }