remove some debugging print statements

Signed-off-by: Alfredo Deza <alfredo.deza@inktank.com>
bump to 1.5.11

Signed-off-by: Alfredo Deza <alfredo.deza@inktank.com>
update the changelog

Signed-off-by: Alfredo Deza <alfredo.deza@inktank.com>
1.5.11