Currently, ryu-manager uses distutils.version.LooseVersion for
"--zapi-frr-version" to parse the given version sting.
With custom type class for oslo_config.cfg.Opt, oslo_config might access
__class__ attribute for equal comparison.
But in case on Python 2, LooseVersion does not have __class__ attribute
and it causes AttributeError. (This error is not always reproduced)
This patch injects required attribute into LooseVersion and avoids this
problem.
Signed-off-by: IWASE Yusuke <iwase.yusuke0@gmail.com>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
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