Add enable_dhcp filter in get_network_info rpc

[yaowei]

As code in
https://github.com/openstack/neutron/blob/master/neutron/api/rpc/handlers/dhcp_rpc.py#L163

the rpc get_active_network called by dhcp-agent to fetch network info, and subnet which enable_dhcp = False is not needed.

It would better add 'enable_dhcp=True' into filter and recheck in dhcp agent would not need.

https://github.com/openstack/neutron/blob/master/neutron/agent/linux/dhcp.py#L344

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/289165

[OpenStack Infra (hudson-openstack)]

Change abandoned by Armando Migliaccio (<email address hidden>) on branch: master
Review: https://review.openstack.org/289165
Reason: This review is > 4 weeks without comment, and failed Jenkins the last time it was checked. We are abandoning this for now. Feel free to reactivate the review by pressing the restore button and leaving a 'recheck' comment to get fresh test results.

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/c/openstack/neutron/+/289165
Committed: https://opendev.org/openstack/neutron/commit/1483b63ffaf933903abf7317b03a99195a71c98a
Submitter: "Zuul (22348)"
Branch: master

commit 1483b63ffaf933903abf7317b03a99195a71c98a
Author: Nurmatov Mamatisa <email address hidden>
Date: Thu Apr 8 18:48:29 2021 +0300

    Add enable_dhcp filter in get_network_info rpc

    Add enable_dhcp, to make a filter to avoid unnecessary
    net_info data transfer through rpc.

    Change-Id: Ibcef366f5b1f4b7da4f47f1f538a17111da0faa1
    Closes-Bug: #1552614

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/neutron 19.0.0.0rc1 release candidate.