removed pyflakes as now deprecated.
swapped pyflakes for pylint in pymode checker
Updates to Spacewalklib and management script

- renamed management script from clone-channel to channel-mgmnt.
  this is more descriptive of the role it is doing.

- added migrate command to channel-mgmnt
  this will allow simple migration of systems from one channel to another.

- Lots of changes to Spacewalklib to tidy it up.
  all calls going through api function is the biggie.