Increase settings for dnsmasq and sysctl

[OpenStack Infra]

https://review.openstack.org/129203
commit 3070f3fa3c6d1b227242fd2a00a7babfc73424f5
Author: Sergii Golovatiuk <email address hidden>
Date: Thu Oct 16 16:27:18 2014 +0200

    Increase settings for dnsmasq and sysctl

    * Make a new variable dhcp_lease_max. It increases the number of
      available leases from 1000 to 1800. It allows to provision nodes on
      scale, when Debian Installer or Anaconda looses IP in the middle of
      install.
    * Make a new variable lease_time. It increases the default lease size
      to 120m, up from the default 60m.
    * Add cache-size to dnsmasq template. dnsmasq will keep more entries in
      case.
    * Increased neighbour table on master node to keep more ARP requests
      that come in parallel once deployment is started. This change also
      removes unneed broadcast traffic. New values are:
      net.ipv4.neigh.default.gc_thresh1 = 256
      net.ipv4.neigh.default.gc_thresh2 = 1024
      net.ipv4.neigh.default.gc_thresh3 = 2048
    * Fix linting

    Related-Bug: #1376680
    Related-Bug: #1379917
    Related-Bug: #1381997
    blueprint 100-nodes-support
    DocImpact

    Change-Id: I4da8070143e401f7a9246e72eda35e601b8c6386

[Bogdan Dobrelya (bogdando)]

It should be enough to provide the info about listed changes just in release-notes

[Sheena Conant (sheena-conant)]

Is this a workaround for an issue present in 6.1 or notes on a feature released on 6.1? It is not clear to me based on the description.

[Sergii Golovatiuk (sgolovatiuk)]

Sheena, this bug is autogenerated for documentation team. Since it's a significant change it should be documented.