webadmin: reports sso token

- Implemented ssoToken based on header value returned on
  login instead of cookie which is no longer readable. This
  token is now passed to the reports application instead of
  the cookie value.

Change-Id: Ib906a1cca87712fb4e31c68c5e8c70151976ce0f
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1095242
Signed-off-by: Alexander Wels <awels@redhat.com>