Logger is not passed required parameter

We should either not log the token and remove %s or log the token.

Original pull request: gh-599.

Author: Iouri Goussev

spring-vault-core/src/main/java/org/springframework/vault/authentication/LifecycleAwareSessionManager.java

@@ -177,7 +177,7 @@ protected void revoke(VaultToken token) {
 			dispatch(new AfterLoginTokenRevocationEvent(token));
 		}
 		catch (RuntimeException e) {
-			this.logger.warn("Cannot revoke VaultToken: %s", e);
+			this.logger.warn(String.format("Cannot revoke VaultToken: %s", token.getToken()), e);
 			dispatch(new LoginTokenRevocationFailedEvent(token, e));
 		}
 	}