Fix proctor login for login_proctor users with Proctor status.

[drgrice1]

This was broken by #2252. The issue is that login_proctor users with Proctor status do not have the allow_course_access behavior. Thus the check on line 509 of lib/WeBWorK/Authen.pm fails. So this skips that check if the login_type starts with "proctor". This will only be true if the WeBWorK::Authen::Proctor module is the current authentication module and the proctor_user parameter is set. Note that the proctor authen module already checks all of the necessary permissions, so this check is not needed. When the check on line 509 of lib/WeBWorK/Authen.pm was in the check_user method of WeBWorK::Authen this check was not even done by the WeBWorK::Authen::Proctor module because that module overrides the check_user method.

To test this create a proctored test that is set with a "Proctor Authorization Type" of "Both Start and Grade", and create a login_proctor user with the Proctor status. Proctor authentication should succeed if the login_proctor user's credentials are entered on the proctor login page. For the develop branch this not only fails, but the message "This user is not allowed to log in to this course" is shown. While that message is true, it is not applicable here. That is the whole point of a login_proctor. Note that set level proctors (hidden users created if you set the "Password" in the "Proctoring Parameters" for a test) automatically have "Proctor" status. So set level proctoring is completely broken.

Also move session creation and setting of $self->{initial_login} to 1 until after the checks now on lines 509-521 of lib/WeBWorK/Authen.pm. Those things should not be done if verify_normal_user is returning 0.