Allow null S3 grantee ID

Minio does not return a grantee so reversing the comparison avoids a
NullPointerException.

Author: gaul

apis/s3/src/main/java/org/jclouds/s3/domain/AccessControlList.java

@@ -209,8 +209,9 @@ public boolean hasPermission(URI granteeURI, String permission) {
     */
    protected Collection<Grant> findGrantsForGrantee(final String granteeId) {
       return Collections2.filter(grants, new Predicate<Grant>() {
+         @Override
          public boolean apply(Grant g) {
-            return g.getGrantee().getIdentifier().equals(granteeId);
+            return granteeId.equals(g.getGrantee().getIdentifier());
          }
       });
    }