Fix for OPENAM-4304 - review: CR-4310
The username is now determined in the HOTP module's init method, so the
HOTPService is correctly initialized for session upgrade scenario as well.

git-svn-id: https://svn.forgerock.org/openam/trunk@10282 0f4defcf-c51a-4c67-9f44-6fb5eba73c5d