dhcp_lease_duration of 'infinite' is not configurable

[Erik Colnick]

In the dhcp-agent, it is not possible to set a dhcp_lease_duration of 'infinite' since the variable is set as an IntOpt in neutron/common/config.py. There are instances, however, where an infinite lease duration may be desirable (particularly in a tripleo installation where the seed may go away but the undercloud and overcloud are expected to persist). Additionally, dnsmasq itself supports the 'infinite' value for the lease-time in the dhcp-range configuration.

[Openstack Gerrit (openstack-gerrit)]

Fix proposed to branch: master
Review: https://review.openstack.org/92453

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/92453
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=624353b2a5290e3a3f481e41bd6bc14afb1b21b3
Submitter: Jenkins
Branch: master

commit 624353b2a5290e3a3f481e41bd6bc14afb1b21b3
Author: Erik Colnick <email address hidden>
Date: Tue May 6 07:56:31 2014 -0600

    Support 'infinite' dhcp_lease_duration

    Process a dhcp_lease_duration value of -1 as 'infinite'
    when setting the dnsmasq dhcp-range values to support
    cases where it is undesirable for instance dhcp leases
    to expire.

    DocImpact

    Closes-Bug: #1315430
    Change-Id: I1cc3cfebfec355014e6d5b5cbd656a1300c43c0b