userportal, webadmin: refresh session on login

- This patch creates a new session when a user attempts to log
  in. This enhances the session management.

Change-Id: I3df427683c924f10cb59f4af1dd067fcfd21a8f2
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1077446
Signed-off-by: Alexander Wels <awels@redhat.com>