Skipped tasks should be removed when drawing a graph

[Dima Shulyak]

Currently skipped tasks represented as grey blocks - it results in a very complicated picture, which is quite hard to use
in order to find required information.

My proposal is to draw only filtered subgraph when flags start/end are used.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/172396

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/172915

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/172396
Committed: https://git.openstack.org/cgit/stackforge/fuel-web/commit/?id=9c96853bf1e31e657d83eec86854fe218204a21d
Submitter: Jenkins
Branch: master

commit 9c96853bf1e31e657d83eec86854fe218204a21d
Author: Sebastian Kalinowski <email address hidden>
Date: Fri Apr 10 14:22:21 2015 +0200

    Add 'remove' param to graph visualization API

    'remove' parameter allows to specify what "internal" type of tasks
    should be removed from visualization of the graph (API endpoint
    endpoint /api/v1//clusters/<cluster_id>/deploy_tasks/graph.gv)

    Example use case: user want to visualize graph without "skipped" tasks.
    It could be achieved by passing "remove=skipped" to the API.

    'void' type has been renamed to 'skipped'

    Change-Id: I9e5e79e9a7c784899a43dc11ece8e85de37d0c2e
    Partial-Bug: #1440633

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/172915
Committed: https://git.openstack.org/cgit/stackforge/python-fuelclient/commit/?id=54e2bce465a96992a6da9ec29565b4799479779e
Submitter: Jenkins
Branch: master

commit 54e2bce465a96992a6da9ec29565b4799479779e
Author: Sebastian Kalinowski <email address hidden>
Date: Mon Apr 13 15:26:03 2015 +0200

    Add 'remove' param for downloading graph

    'remove' param allows to specify which type of tasks
    will be removed from visualization of the graph.
    For example:

      fuel graph --env 1 --download --start pre_deployment_start \
          --end pre_deployment_end --remove skipped > graph.gv

    will show tasks between only pre_deployment_start and
    pre_deployment_end and internall tasks (groups, stages)

    Change-Id: I7199827d80f18ba7ddeb6b78ac8d50865e346e4a
    Depends-On: I9e5e79e9a7c784899a43dc11ece8e85de37d0c2e
    Closes-Bug: #1440633