The object specifies the authorization type of SSH user. When authorizationAAA is specified,
the SSH user will be authorizated by HWTACACS server. The default authorization is authorizationNULL,
indicating SSH user doesn't need to be authorizated by HWTACACS server.
Options:
1.authorizationNULL(1)-The default authorization is authorizationNULL,indicating SSH user
doesn't need to be authorizated by HWTACACS server.
2.authorizationAAA(2) -When authorizationAAA is specified,the SSH user will be
authorizated by HWTACACS server.