Astute do not support task concurrency

[Vladimir Sharshov]

Detailed bug description:
    Astute should allow to setup task concurrency for every task

Steps to reproduce:
    Add block for task, sync tasks and run deployment with more nodes with this task, then setup in parameters
    parameters:
      strategy:
        type: parallel
        amount: 2

Expected results:
    Selected task should run only run in parallel on 2 nodes.
Actual result:
  It will run in parallel in all nodes where tasks should executed
Reproducibility:
 Always
Workaround:
 Setup node global concurrency

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/306578

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/306578
Committed: https://git.openstack.org/cgit/openstack/fuel-astute/commit/?id=e4b84a3383cdd4fe275099c0e4a6196184c457b4
Submitter: Jenkins
Branch: master

commit e4b84a3383cdd4fe275099c0e4a6196184c457b4
Author: Vladimir Sharshov (warpc) <email address hidden>
Date: Fri Apr 15 21:17:25 2016 +0300

    Support task concurrency

    Without this changes Astute will ignore information about
    task strategy and will run as many as possible tasks on suitable nodes.
    The only limit which can be used in this case is node concurrency,
    but it will decrise deployment performance

    Also change log level for message about concurrency
    from info to debug, because in mostly cases they are required
    only for developers

    DocImpact
    Closes-Bug: #1571014

    Change-Id: I4f27da4abdaf4939002b62d05a44e23d3f1a3d5e

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/mitaka
Review: https://review.openstack.org/307996

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/307996
Committed: https://git.openstack.org/cgit/openstack/fuel-astute/commit/?id=88572290eb4fdf74b7d41a54048e903b1a1fa43a
Submitter: Jenkins
Branch: stable/mitaka

commit 88572290eb4fdf74b7d41a54048e903b1a1fa43a
Author: Vladimir Sharshov (warpc) <email address hidden>
Date: Fri Apr 15 21:17:25 2016 +0300

    Support task concurrency

    Without this changes Astute will ignore information about
    task strategy and will run as many as possible tasks on suitable nodes.
    The only limit which can be used in this case is node concurrency,
    but it will decrise deployment performance

    Also change log level for message about concurrency
    from info to debug, because in mostly cases they are required
    only for developers

    DocImpact
    Closes-Bug: #1571014

    Change-Id: I4f27da4abdaf4939002b62d05a44e23d3f1a3d5e
    (cherry picked from commit e4b84a3383cdd4fe275099c0e4a6196184c457b4)