exposing the configuration of the header corresponding to the client cert location in the tls offload case in the rest-sts UI.

git-svn-id: https://svn.forgerock.org/openam/branches/sts_x509@10298 0f4defcf-c51a-4c67-9f44-6fb5eba73c5d
reverting changes to the RestAuthX509CallbackHandler, as these changes are not necessary.

git-svn-id: https://svn.forgerock.org/openam/branches/sts_x509@10299 0f4defcf-c51a-4c67-9f44-6fb5eba73c5d