Fix E303 linter error
Fix E303 linter error

Too many blank lines

Signed-off-by: Renan Rodrigo <35839d1b7844ddf1b0506a3c8c1a1b10e6388c5b@ime.usp.br>
Signed-off-by: Diego Rabatone Oliveira <cf50ea70b3afa778c69ebabc92a02a3aa169aac9@ncc.unesp.br>

kytos/python-openflow,cemsbr/python-openflow