stable/pike

This is to work around an issue that a broken pipe exception might get thrown when we invoke this purge through neutron client API. We don't have this issue when its invoked thru CLI. Change-Id: I94d6ab8658efc08dd5be8dbd348e098453e71b39 (cherry picked from commit 0833afb6de2f636064f930661b37ba07f8d8b6c8)
This is the client API library for Group Based Policy.
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