Manager CLI doesn't depend on flask-script anymore
    
    freshmaker/manage.py does not depend on flask-script from now on.
    The original freshmaker-* commands are not changed, for example,
    
        freshmaker-upgradedb
    
    Note that, FRESHMAKER_DEVELOPER_ENV have to be set to ensure the dev
    config is loaded correctly for development.
    
    During development, those manager commands can also run from manage.py
    directly:
    
    	python freshmaker/manage.py
    
    Another change happens to command runssl. That is, app.run() is replaced
    with the direct call to run_simple to avoid flask logs this warning and
    stops the run.
    
        Silently ignoring app.run() because the application is run from the
        flask command line executable.
    
    Signed-off-by: Chenxiong Qi <cqi@redhat.com>