Add fuel2 commands to undiscover nodes

[OpenStack Infra]

https://review.openstack.org/354117
Dear bug triager. This bug was created since a commit was marked with DOCIMPACT.

commit 5353de7848e6f67fd30f374ea7604cb867b34d9e
Author: tivaliy <email address hidden>
Date: Sat Jul 23 22:05:24 2016 +0300

    Add fuel2 commands to undiscover nodes

    Release new fuel2 commands that allow to undiscover
    (delete from database) nodes regardless of their
    state (-f/--force flag), e.g.:

       fuel2 node undiscover [-h] (-e ENV | -n NODE) [-f]

    DocImpact

    Change-Id: I61d0b635f72d4c68c10aced58c6823857c6c0eea

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/369298

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/369298
Committed: https://git.openstack.org/cgit/openstack/fuel-docs/commit/?id=87b50fe4062cf6bebf016b58eaa5aa9351890de5
Submitter: Jenkins
Branch: master

commit 87b50fe4062cf6bebf016b58eaa5aa9351890de5
Author: Olena Logvinova <email address hidden>
Date: Tue Sep 13 12:46:45 2016 +0300

    [UG] [CLI] Consolidated Fuel CLIs v1 and v2

    This patch:

    - adds a deprecation note for Fuel CLI v1 to the
      Fuel CLI section of the Fuel User Guide;
    - adds a table with consolidated fuel and fuel2
      commands;
    - fixes noticed typos and formatting discrepancies.

    Change-Id: Ibb005e3ecc4d094229f9b7c951a92fe9e5d6574e
    Closes-Bug: #1608883
    Closes-Bug: #1609815
    Closes-Bug: #1619200
    Closes-Bug: #1618873
    Closes-Bug: #1618456
    Closes-Bug: #1612611
    Closes-Bug: #1612609
    Closes-Bug: #1611835
    Closes-Bug: #1612148
    Closes-Bug: #1612151
    Closes-Bug: #1612218
    Closes-Bug: #1612610
    Closes-Bug: #1612606
    Closes-Bug: #1612607
    Closes-Bug: #1612227
    Closes-Bug: #1621807
    Closes-Bug: #1621838
    Closes-Bug: #1623595
    Closes-Bug: #1612608
    Closes-Bug: #1619290
    Closes-Bug: #1612598
    Closes-Bug: #1624044