Set max_overflow and max_pool_size parameters in depend on hardware

[Leontii Istomin]

We have faced with the following error from neutron-server logs during spawning 48 instances using heat: http://paste.openstack.org/show/593483/

We need to increase max_overflow and max_pool_size parameters. I suggest to use Fuel experience and set those parameters in depend on available hardware resources on a node. Implementation in Fuel: https://github.com/openstack/fuel-library/blob/stable/mitaka/deployment/puppet/osnailyfacter/manifests/globals/globals.pp#L332-L333

environment description:
200 hardware nodes, calico network. ccp configs are attached

[OpenStack Infra (hudson-openstack)]

Related fix proposed to branch: master
Review: https://review.openstack.org/424095

[OpenStack Infra (hudson-openstack)]

Related fix proposed to branch: master
Review: https://review.openstack.org/424096

[OpenStack Infra (hudson-openstack)]

Related fix proposed to branch: master
Review: https://review.openstack.org/424097

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/424526

[Peter Razumovsky (prazumovsky)]

There was the decision to let MK or manually calculate necessary values of max_overflow and max_pool_size, so adding these config options (and ability to configure specific node) is enough from CCP side.

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/424526
Committed: https://git.openstack.org/cgit/openstack/fuel-ccp-neutron/commit/?id=3f0d6ecede79cfdca7ef4bec340611ff4a4a8b44
Submitter: Jenkins
Branch: master

commit 3f0d6ecede79cfdca7ef4bec340611ff4a4a8b44
Author: Peter Razumovsky <email address hidden>
Date: Tue Jan 24 13:13:02 2017 +0400

    Add config options for database section

    Add max_pool_size and max_overflow for database section
    of config file. This helps to customize database limits for
    ccp and further for each node.

    Change-Id: Ibfe7ac44e73b8540d7cfe73eaae041c70bbc9a73
    Closes-bug: #1653077

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/424095
Committed: https://git.openstack.org/cgit/openstack/fuel-ccp/commit/?id=341d3582e0a99baf3733612417b693752eaf89e3
Submitter: Jenkins
Branch: master

commit 341d3582e0a99baf3733612417b693752eaf89e3
Author: Peter Razumovsky <email address hidden>
Date: Mon Jan 23 15:09:10 2017 +0400

    Add configs map for nodes

    Now node definition can contain configs map,
    which will add new configs especially for this node
    or override current globals for the node.

    Change-Id: I4de6a0fad94d5f83ca486c952d80d1c87c880c0e
    Related-bug: #1653077

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/424097
Committed: https://git.openstack.org/cgit/openstack/fuel-ccp-entrypoint/commit/?id=0feaf3e1c26ad9eb3223cd468bbbb07077c31872
Submitter: Jenkins
Branch: master

commit 0feaf3e1c26ad9eb3223cd468bbbb07077c31872
Author: Peter Razumovsky <email address hidden>
Date: Mon Jan 23 15:52:27 2017 +0400

    Handle nodes configs and merge them with globals

    Get nodes configs map, check for existing configs for
    current node, and if it is, merge it with globals config - variables
    for further using in jinja and so on.

    Change-Id: I379f4840e6093b7910b5d7dd612de62b1fe0ac2e
    Depends-on: I4de6a0fad94d5f83ca486c952d80d1c87c880c0e
    Related-bug: #1653077

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/424096
Committed: https://git.openstack.org/cgit/openstack/fuel-ccp/commit/?id=df907ee69860d758ea81ad005bf6dac7dbc0a8e8
Submitter: Jenkins
Branch: master

commit df907ee69860d758ea81ad005bf6dac7dbc0a8e8
Author: Peter Razumovsky <email address hidden>
Date: Mon Jan 23 16:52:18 2017 +0400

    Add documentation for nodes configs

    Added new sub-key definition to documentation. Refactor nodes
    and roles key types description in docs.

    Change-Id: Ie8f15044e05c67e1ed1a8919e07ded3518e6b24c
    Depends-on: I379f4840e6093b7910b5d7dd612de62b1fe0ac2e
    Related-bug: #1653077