Add missing dots at the end of exception messages

Author: fabpot

Authentication/Provider/LdapBindAuthenticationProvider.php

@@ -68,7 +68,7 @@ public function setQueryString($queryString)
     protected function retrieveUser($username, UsernamePasswordToken $token)
     {
         if (AuthenticationProviderInterface::USERNAME_NONE_PROVIDED === $username) {
-            throw new UsernameNotFoundException('Username can not be null');
+            throw new UsernameNotFoundException('Username can not be null.');
         }
 
         return $this->userProvider->loadUserByUsername($username);

User/LdapUserProvider.php

@@ -81,7 +81,7 @@ public function loadUserByUsername($username)
         }
 
         if ($count > 1) {
-            throw new UsernameNotFoundException('More than one user found');
+            throw new UsernameNotFoundException('More than one user found.');
         }
 
         $entry = $entries[0];