CR-1533 Partial fix for OPENAM-1390: Describe IDM cache options (preparatory cleanup)

git-svn-id: https://svn.forgerock.org/openam/trunk/openam@5015 0f4defcf-c51a-4c67-9f44-6fb5eba73c5d
CR-1530 Fix for OPENAM-1390: Describe IDM cache options

git-svn-id: https://svn.forgerock.org/openam/trunk/openam@5018 0f4defcf-c51a-4c67-9f44-6fb5eba73c5d