mgr/dashboard: fix linter complaints

mgr/dashboard: fix linter complaints

In addition to line ordering, there were a couple of bogus ones:
E: 30, 0: No name 'version' in module 'distutils' (no-name-in-module)
E: 30, 0: Unable to import 'distutils.version' (import-error)
E: 36, 8: No name 'wsgiserver' in module 'cherrypy' (no-name-in-module)
E: 36, 8: Unable to import 'cherrypy.wsgiserver.wsgiserver2' (import-error)

I don't know why pylint can't see these modules, but they're definitely
there, so I've added them to the ignored list in .pylintrc

Signed-off-by: John Spray <john.spray@redhat.com>