To make deployment graph more readable add option to use 'tred' in fuelclient

[Sebastian Kalinowski]

Right now we get raw DOT graph in fuelclient. There is a lot of connection between tasks that makes a lot of noise.
To improve readability we should add option to process whole graph with "tred" [1] (if Graphviz is installed)

Results before and after can be seen in attachments.

[1] http://www.graphviz.org/pdf/tred.1.pdf

[Vladimir Sharshov (vsharshov)]

Can be safely moved to 8.0 because it is feature.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/234066

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/234066
Committed: https://git.openstack.org/cgit/stackforge/python-fuelclient/commit/?id=655db5e96282bbafc4dae54462a01823b6b464cb
Submitter: Jenkins
Branch: master

commit 655db5e96282bbafc4dae54462a01823b6b464cb
Author: Ivan Kliuk <email address hidden>
Date: Mon Oct 12 21:51:03 2015 +0300

    Add transitive reduction filter for task graphs

      Remove 'pydot_ng' that doesn't support transitive reduction filtering.
      Add '--tred' option for CLI.
      Usage example:

          fuel graph --render graph.gv --tred
          fuel graph --render graph.gv --dir ./output/dir/ --tred

    Change-Id: Ibfd7112dc0751df9bcadd0ab46e29f5159cbb3a5
    Closes-bug: #1443446

[Artem Hrechanychenko (agrechanichenko)]

Verified on Ubuntu and CentOS master nodes:

Ubuntu - pass
Centos - cannot install python pygraph library - https://bugs.launchpad.net/fuel/+bug/1510884

[Artem Hrechanychenko (agrechanichenko)]

Update

On CentOS fuel graph --render completely broken because it required pygraphviz library, which cannot be installed on CentOS

https://bugs.launchpad.net/fuel/+bug/1510884

[Artem Hrechanychenko (agrechanichenko)]

Need to re-check after resolving https://bugs.launchpad.net/fuel/+bug/1510884
After manually build and install package - all works fine