OPENAM-2948:RESTful read performance: identityExists() is called twice before searching user entry

git-svn-id: https://svn.forgerock.org/openam/trunk/openam@6920 0f4defcf-c51a-4c67-9f44-6fb5eba73c5d
[OPENAM-3118]Align with OPENAM-2838, latest additions to XUI config file (themeConfig.json)

git-svn-id: https://svn.forgerock.org/openam/trunk/openam@6924 0f4defcf-c51a-4c67-9f44-6fb5eba73c5d