CAY-1827 EhCache region corresponding to a cache group loses it settings after 'removeGroup'

git-svn-id: https://svn.apache.org/repos/asf/cayenne/main/trunk@1486001 13f79535-47bb-0310-9956-ffa450edef68
CAY-1827 EhCache region corresponding to a cache group loses its settings after 'removeGroup'

git-svn-id: https://svn.apache.org/repos/asf/cayenne/main/trunk@1486002 13f79535-47bb-0310-9956-ffa450edef68