Fix ci scripts to use abs paths

ci/pep8.sh

 #!/usr/bin/env sh
 
-pep8 devflow ci
+r=$(dirname $(realpath $0))/..
+pep8 $r/devflow

ci/pylint.sh

 #!/usr/bin/env sh
 
-pylint devflow ci
+r=$(dirname $(realpath $0))/..
+pylint $r/devflow