update make system for stable/6.1 to be able to build late artifacts

[Sergey Kulanov]

We need to update make system for stable/6.1 with below functionality:

- Allow rebuild second level artifacts without rebuild 1-st level packages
- Ensure that packages version for the second level artifacts grows, allows us correct updates

Current status:
For now we have a list of patches, that are currently not merged and used for cherry-picking in patching-ci:
1. https://review.openstack.org/#/c/187126/
2. https://review.openstack.org/#/c/194448/
3. https://review.openstack.org/#/c/197478/
so we need finally merge those patches without any impact on current 6.1 make iso workflow

[Sergey Kulanov (skulanov)]

https://review.openstack.org/#/c/213020/

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/213020
Committed: https://git.openstack.org/cgit/stackforge/fuel-main/commit/?id=915c5a6895851304cbd8bd9371516c78dac9187a
Submitter: Jenkins
Branch: stable/6.1

commit 915c5a6895851304cbd8bd9371516c78dac9187a
Author: Sergey Kulanov <email address hidden>
Date: Fri Aug 14 11:03:51 2015 +0300

    Build late artifacts without rebuilding fuel packages

    Implement flag PATCHING_CI, which is equal 0, means: patching
    feature is disabled.

    If PATCHING_CI=1, then:

    1) Add 6.1-release mirror [1];
    2) Build iso with BUILD_PACKAGES=0
       late packages (fuel-bootstrap-image, fuel-target-centos-images,
       fuel-docker-images) should be always build in spite of
       BUILD_PACKAGES flag, since they are depend on the first level
       artifacts (packages);
    3) Update requirements-*.txt files with patching approach since
       we need to store original requirements.txt and be sure that
       building staging mirror will produce the same results as for
       release 6.1;
    4) Make sure the release version of bootstrap, centos-image and
       docker packages is increasing.
        We need to be sure that packages (in packages-late target):
         - fuel-bootstrap-image
         - fuel-target-centos-images
         - fuel-docker-images
        will increase their release numbers by 1 continuously
        in order to be able to ship them in updates repositories.

    [1]. http://mirror.fuel-infra.org/fwm/6.1-release/

    Closes-bug: #1484534

    Change-Id: I135136e27040d1663364c3384dea55cf25860a5a

[Fuel Devops McRobotson (fuel-devops-robot)]

Reviewed: https://review.fuel-infra.org/12097
Submitter: Igor Belikov <email address hidden>
Branch: master

Commit: 659325d8d594cfd81c9ffe1c1080c947bd888495
Author: Sergey Kulanov <email address hidden>
Date: Mon Oct 5 15:07:47 2015

Remove cherry-picked commits from building late artifacts job

Since we've implemented [1] working solution for building late
artifact packages for stable/6.1 we can remove cherry-picked
patchsets and set flag:
   PATCHING_CI=1

[1] https://review.openstack.org/#/c/213020/

Related-bug: #1484534

Change-Id: I7d168f6a741834dc056617b2761bf4dc71609ae8