Create decorator "patch_fuel_agent"

[Artem Hrechanychenko]

According to https://mirantis.jira.com/browse/QA-826 need create decorator patch_fuel_agent

Scenario:
1. Revert snapshot of ready environment
2. Update fuel-agent in mcollective container via rpm packet
3. Update fuel-agent in unpacked bootstrap image via patch
4. Generate new bootstrap image and register it cobbler

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/249895

[OpenStack Infra (hudson-openstack)]

Change abandoned by Artem Grechanichenko (<email address hidden>) on branch: master
Review: https://review.openstack.org/249895

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/251804

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/251804
Committed: https://git.openstack.org/cgit/openstack/fuel-qa/commit/?id=f17ec5d130844a434665990513626fd36bce3e63
Submitter: Jenkins
Branch: master

commit f17ec5d130844a434665990513626fd36bce3e63
Author: Artem Grechanichenko <email address hidden>
Date: Tue Dec 1 13:20:49 2015 +0200

    Add gate test for fuel-agent repo

    Add gate test for fuel-agent that should be executed
    for each review in openstack/fuel-agent repo.

    Next variables should be exported:
    UPDATE_FUEL=True
    UPDATE_FUEL_PATH=/path/to/source

    Test depends on ready,
    so it is better to run it with -k option.

    Scenario:
        1. Revert snapshot "ready"
        2. Update fuel-agent in MCollective
        3. Update bootstrap
        4. Bootstrap 1 slave
        5. Create environment via FUEL CLI
        6. Assign controller role
        7. Provisioning node

    Change-Id: I323398d5a039896f3ec8793ba64b6a6541a4967f
    Closes-Bug: #1519880

[Artem Hrechanychenko (agrechanichenko)]

Need to add code to rebuilding bootstrap with new code for fuel-agent from review

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/254683

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/254683
Committed: https://git.openstack.org/cgit/openstack/fuel-qa/commit/?id=7523e5e232c5bce4e71404de78f4555d787d947f
Submitter: Jenkins
Branch: master

commit 7523e5e232c5bce4e71404de78f4555d787d947f
Author: Artem Grechanichenko <email address hidden>
Date: Wed Dec 9 23:19:12 2015 +0200

    Adding bootstrapping rebuilding to test_review_in_fuel_agent

    Adding gates_test/helpers/utils patch_bootstrap methods
    to rebuild centos and ubuntu bootstraps to use new code
    from fuel-agent review.
    Methods for CentOS bootstrap commented and unused.

    Change-Id: I8cc601dfa53f71b4e1d78814ce451ea9d98940e9
    Closes-Bug: #1519880