Remove min_l3_agents_per_router option

[zhongshengping]

min_l3_agents_per_router parameter has been removed in neutron[0], so we can remove it.

[0] https://github.com/openstack/neutron/blob/master/releasenotes/notes/remove-min-l3-agents-per-router-27aef7d91dec0348.yaml

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/451163

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/451163
Committed: https://git.openstack.org/cgit/openstack/openstack-ansible-os_neutron/commit/?id=ff8e42cc99e718a8a5299d5f1141610807de9f87
Submitter: Jenkins
Branch: master

commit ff8e42cc99e718a8a5299d5f1141610807de9f87
Author: ZhongShengping <[e-mail]>
Date: Wed Mar 29 11:34:43 2017 +0800

    Remove min_l3_agents_per_router option

    min_l3_agents_per_router parameter has been removed in neutron, so
    we can remove it.

    Change-Id: Ib919b8cbd3daa8b9b4394567b828d6e9b7b00b32
    Closes-Bug: #1677101

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/openstack-ansible-os_neutron 16.0.0.0b1 development milestone.

[Eduardo Gonzalez (egonzalez90)]

Kolla-ansible released patch https://review.openstack.org/#/c/451159/

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/kolla-ansible 5.0.0.0b2 development milestone.