Need to change link to Heat test image in docs

[Anastasia Kuznetsova]

In "Preparing Heat for Testing" section in FUEL documentation there is a link with special Fedora ISO that in needed for autoscaling OSTF test.

This link is invalid and received 404 error.

In stable/6.0 : need to change this link to active resource with it image
In master need to delete this section from documentation because we won't be need to upload a special image for Heat tests.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/6.0
Review: https://review.openstack.org/141416

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/143429

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/143779

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/143779
Committed: https://git.openstack.org/cgit/stackforge/fuel-docs/commit/?id=31a3e8f3a0e11eccf3d3c059ba4fa279cae7fa47
Submitter: Jenkins
Branch: master

commit 31a3e8f3a0e11eccf3d3c059ba4fa279cae7fa47
Author: Anastasia Kuznetsova <email address hidden>
Date: Fri Dec 12 19:04:54 2014 +0400

    Fix URL for Heat test image

    In "Preparing Heat for Testing" section in FUEL documentation
    there is a link with special Fedora ISO.

    This link now is invalid and I updated it.

    Change-Id: I7f85840fe2b5214c157370eb55a19ea2b65b38a9
    Closes-Bug: #1401940

[OpenStack Infra (hudson-openstack)]

Change abandoned by Anastasia Kuznetsova (<email address hidden>) on branch: stable/6.0
Review: https://review.openstack.org/141416

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/143429
Committed: https://git.openstack.org/cgit/stackforge/fuel-docs/commit/?id=3945cd85f66b6c9cc2a34baef8c9893fbbec4e4e
Submitter: Jenkins
Branch: master

commit 3945cd85f66b6c9cc2a34baef8c9893fbbec4e4e
Author: Anastasia Kuznetsova <email address hidden>
Date: Mon Dec 22 14:47:26 2014 +0400

    Remove 'heat-prepare-test' article

    In "Preparing Heat for Testing" section in FUEL documentation
    there is a link with special Fedora ISO that needs to be uploaded.
    In the next FUEL release we won't upload any special ISO for heat tests,
    so this page is unnecessary.

    Change-Id: Idf3009346027ccb4b2ce982fe30a86975e67ed6c
    Closes-Bug: #1401940

[Anastasia Kuznetsova (akuznetsova)]

This bug is not actual for 6.1, because OSTF tests in this release don't use special image, that's why we don't need to fix url in docs.