BUG: Upper and lower bounds for Clamp filter were not correctly set

Change-Id: I9eb0f8c70e218a0724358fa7245a9002776544da
Merge branch 'SIMPLEITK-551_FixClampFiltersBounds' into release

* SIMPLEITK-551_FixClampFiltersBounds:
  BUG: Upper and lower bounds for Clamp filter were not correctly set

Change-Id: Ifb85b9d3875d12212b6824625bf774bb64c2ab32