/usr/lib/mysql/plugin/daemon_example.ini is in percona-server-server-5.6 5.6.22-rel71.0-0ubuntu4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# Plugin configuration file. Place the following on a separate line:
#
# library binary file name (without .so or .dll)
# component_name
# [component_name] - additional components in plugin
#
libdaemon_example
daemon_example
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