Remove sudo from build project process

Done:
  1. sudo was removed for docker operations, by adding user
     to docker group.
  2. RPM-packages build with mock ($SOURCE/packages/rpm)
  3. initramfs prepared using mock ($SOURCE/bootstrap)
  4. OpenStack packages build with
     mock ($SOURCE/packages/openstack/rpm)

Notes:
 - Ask user to re-login, in order to correctly process group membership
 - Fix issue (pinning) with multistrap version  (#1312654)
 - Fix npm global installation permission issue (#1337343)
 - Ensure nodejs installation from chris-lea (out-of-the-box nodejs should
   be also «ok», as it was mentioned https://review.openstack.org/#/c/117212/)
 - Fix lrzip periodical issue with infinite loop (removed -U option)
 - Ensure bc package is present (for building img file)
 - Old files saved for checking and comparison (draft) should be removed
   in future, while new files include mock: module_mock.mk, mock_config.mk

ToDo:
  - Fix sudo for createchroot.mk for ubuntu (propose here to use docker).
    We can create simple template like (fuel/centos, fuel/busybox)
  - Fix sudo for building img targets
  - Need to finish with openstack createrepo as there is no access to internal Mirantis
    resources (repo: http://mirrors.msk.mirantis.net/centos/) from outside:

Additional information:
  - mock (1.1.33-1) is currently used in Ubuntu 14.04. But it has some bugs,
    so we are fixing them in prepare-build-env.sh (create mock user, and system folders)
  - we use three different mock environments (rpm, bootstrap, openstack),
    for each environment we need to define 3 configuration files, which can be customized:
    site-defaults.cfg, logging.ini, fuel-$(PRODUCT_VERSION)-$(CENTOS_ARCH).cfg
  - Optimization should be performed: mock optimization, reusing the same environments,
    do not clear cache after build, enable ccache, use tmpfs, check  “file” options for mock in
    order to pass files to chroot environment, etc (should be discussed)