added the CREST version information to all http client invocations which consume CREST services.

git-svn-id: https://svn.forgerock.org/openam/branches/sts_x509@10348 0f4defcf-c51a-4c67-9f44-6fb5eba73c5d
removed comment based upon code-review comment.

git-svn-id: https://svn.forgerock.org/openam/branches/sts_x509@10349 0f4defcf-c51a-4c67-9f44-6fb5eba73c5d