cloudmonkey: make code PEP8 compliant

Signed-off-by: Rohit Yadav <rohit.yadav@shapeblue.com>
cloudmonkey: in case filter is passed and is of length 1, don't print ruler

Signed-off-by: Rohit Yadav <rohit.yadav@shapeblue.com>
cloudmonkey: change signature to default to [] instead of None filter

Signed-off-by: Rohit Yadav <rohit.yadav@shapeblue.com>
cloudmonkey: Don't print ruler when filter size is one

Signed-off-by: Rohit Yadav <rohit.yadav@shapeblue.com>