iptables manager may fail to apply firewall rules if another iptables* process is being executed
Environment
- Red Hat Enterprise Linux OpenStack Platform 6.
- Red Hat Enterprise Linux OpenStack Platform 7.
- Red Hat OpenStack Platform 8.
- Red Hat OpenStack Platform 9.
- Red Hat OpenStack Platform 10.
- Red Hat OpenStack Platform 11.
- Red Hat Enterprise Linux 7.4
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