/usr/lib/python2.7/dist-packages/charmtools/templates/bash/files/hooks/config-changed is in charm-tools 2.1.2-0ubuntu4.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 | #!/bin/bash
# config-changed occurs everytime a new configuration value is updated (juju set)
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