seperate chef installer as a plugin

[Carl]

chef installer used for openstack Icehouse is somewhat deprecated, we want to make it as a separate plugin so that it is easier to choose whether to install it or not during compass installation.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/235724

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/235724
Committed: https://git.openstack.org/cgit/openstack/compass-core/commit/?id=138f0454119c22eb370c7bd44aef172c81656c3d
Submitter: Jenkins
Branch: master

commit 138f0454119c22eb370c7bd44aef172c81656c3d
Author: Carl Li <email address hidden>
Date: Thu Oct 15 20:03:30 2015 -0700

    Seperate chef installer as a plugin
    Bug: 1506700

    This is the first change list of a series of changes that will eventually
    convert chef installer as a plugin.
    It moves chef installer related configure files to the plugins/chef_installer/
    util.py's load_configs is modified to read not only the ordinary configs but
    also the configs in each of plugins directory.

    Change-Id: I285c59556f4abd89255608e15117e6d012ecfb01

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/239202

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/240100

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/240692

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/239202
Committed: https://git.openstack.org/cgit/openstack/compass-core/commit/?id=b073a7837fef446e69722f42b14b9d4bd8ac459e
Submitter: Jenkins
Branch: master

commit b073a7837fef446e69722f42b14b9d4bd8ac459e
Author: Carl Li <email address hidden>
Date: Sat Oct 24 18:05:39 2015 -0700

    Seperate chef installer as a plugin (move chef templates to plugins directory)
    Bug: 1506700

    This is the second change list of a series of changes that will eventually
    convert chef installer as a plugin.
    It moves chef installer related templates files to the plugins/chef_installer/templats
    PLUGINS_DIR was introduced to indicate where the plugins directory will be, it may be in /etc/compass or in a different place util.py's load_configs will use it when reading plugins configs.

    Change-Id: Ieb599e3e7c8cecd8355e77d89e3da8548f78a93a

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/240100
Committed: https://git.openstack.org/cgit/openstack/compass-core/commit/?id=02d07a8ad1b5adcea5ead830496c848419599111
Submitter: Jenkins
Branch: master

commit 02d07a8ad1b5adcea5ead830496c848419599111
Author: Carl Li <email address hidden>
Date: Wed Oct 28 19:40:24 2015 -0700

    Seperate chef installer as a plugin (move chef_installer.py to plugins directory)
    Bug: 1506700

    This is the third change list of a series of changes that will eventually
    convert chef installer as a plugin.
    It moves chef_installer.py to the plugins/chef_installer/implementation
    The related test was modified accordingly but should be moved to plugins directory in the next change list.

    Change-Id: Idb2a6f7f9b1e612d737674d811e9b4e6d7b6212b

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/240692
Committed: https://git.openstack.org/cgit/openstack/compass-core/commit/?id=a165bbe6bcdab3ddfb901569117d42d10515ed91
Submitter: Jenkins
Branch: master

commit a165bbe6bcdab3ddfb901569117d42d10515ed91
Author: Carl Li <email address hidden>
Date: Sat Oct 31 23:02:55 2015 -0700

    Seperate chef installer as a plugin (move chef tests to plugin directory)

    Closes-Bug: #1506700

    This is the 4th change list of a series of changes that will eventually
    convert chef installer as a plugin.
    It moves chef installer related tests to plugins directory
    extract a method get_plugins_config_files from load_config in util.py,
    this function might be used directly, add a unit test for this function

    Change-Id: Idbd54ce11ab4489b356b402d176c9df2f688acc2

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/245003

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/245003
Committed: https://git.openstack.org/cgit/openstack/compass-core/commit/?id=d825d6e6d7834103d0ed1d240538e772307a22e8
Submitter: Jenkins
Branch: master

commit d825d6e6d7834103d0ed1d240538e772307a22e8
Author: Carl Li <email address hidden>
Date: Thu Nov 12 22:21:04 2015 -0800

    Add README.md to the plugins directory

    Closes-Bug: #1506700

    Add README.md to the plugins directory

    Change-Id: I41c7dc75c20b67e416f3a16430182d59610904f5