Cleanup .ctl/.pid files for both OpenSwan and LibreSwan

[OpenStack Infra]

https://review.openstack.org/235817
commit a71f30b232c7b2f44cb1d7512407bb9ec75564c4
Author: Elena Ezhova <email address hidden>
Date: Fri Oct 16 12:31:48 2015 +0300

    Cleanup .ctl/.pid files for both OpenSwan and LibreSwan

    Change I5c215d70c348524979b740f882029f74e400e6d7 introduced cleanup
    of pluto ctl/pid files on starting and restarting of pluto daemon
    for LibreSwan driver. But the problem with managing these files is
    also common for the OpenSwan driver: pluto daemon fails to start if
    a pid file it tries to create already exists (see bug report for
    details).

    This change moves the cleaup functionality to the OpenSwanProcess so
    that is will be used by both OpenSwan and LibreSwan drivers.
    Also fixed a typo in _cleanup_control_files where it was attempted to
    remove pluto.ctl.ctl file instead of pluto.ctl

    Changed the name of 'libreswan' configuration section to 'pluto'.

    DocImpact

    Change-Id: I717e8fcc1add35b7099c977235e4eff5da9e093b
    Closes-Bug: #1506794

[Tom Fifield (fifieldt)]

This change should get picked up by autogenerate-config-docs. The section has been renamed

[venkatamahesh (venkatamaheshkotha)]

The table is updated at .rst migration . Reference :https://github.com/openstack/openstack-manuals/blob/master/doc/config-reference/source/tables/neutron-vpnaas_ipsec.rst