Build all scripts in install/tools/ to check them with pylint, so that
``make pylint`` always checks all scripts. The script files are
generated by make.

Please note that fastlint does not check script files.

See: https://pagure.io/freeipa/issue/7772


Signed-off-by: Christian Heimes <cheimes@redhat.com>
Reviewed-By: Thomas Woerner <twoerner@redhat.com>
Reviewed-By: Rob Crittenden <rcritten@redhat.com>
Reviewed-By: Tibor Dudlak <tdudlak@redhat.com>