checkstyle.sh: fix for environments where pylint != pylint2

Signed-off-by: Thomas Stilwell <stilwellt@openlabs.co>
Merge pull request #632 from benemorius/pylintfix

checkstyle.sh: fix for environments where pylint != pylint2
Revert PR #621
Merge pull request #633 from dionyziz/revert_621

Revert PR #621
disable public ip detection/updating when run.sh -i argument is used

fixes #472

Signed-off-by: Thomas Stilwell <stilwellt@openlabs.co>