config_controller need the input of a non-configurable attributes

[Ran An]

Brief Description
-----------------
according to Story https://storyboard.openstack.org/#!/story/2003087. configuration attributes "link_capacity" of mgmt network is removed. But we still need to input a value for it during process config_controller.

Severity
--------
Minor

Steps to Reproduce
------------------
type "sudo config_controller" on controller after initializing.

Expected Behavior
------------------
no input require for "Management interface link capacity Mbps "

Actual Behavior
----------------
there is a step to input "Management interface link capacity Mbps"

Reproducibility
---------------
Reproducible

System Configuration
--------------------
Any system with 1G mgmt interface and 2+ nodes.

Branch/Pull Time/Commit
-----------------------
stx master as of "2018-11-20_22-01-43"

Timestamp/Logs
--------------

[Ghada Khalil (gkhalil)]

Marking as release gating.
In addition to config_controller, configutilities (gui) will also need to be updated.

Please make sure to send an email to starlingx-discuss as a heads up before submission.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/625018

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/625018
Committed: https://git.openstack.org/cgit/openstack/stx-config/commit/?id=e63b1d0de9efb6309117a6c2d17fd4e91ec88474
Submitter: Zuul
Branch: master

commit e63b1d0de9efb6309117a6c2d17fd4e91ec88474
Author: SidneyAn <email address hidden>
Date: Mon Dec 17 08:57:07 2018 +0800

    removing link capacity configuration during controller config

    This commit related modules during controller config. It removes
    a) the "link capacity" option of inputs/config file when
       config_controller run.
    b) "link_speed" generation and validation in configfiletool and
       config_validator.
    c) related unit test.

    Tests conducted:
    a) run '$sudo config_controller' and input configuration.
    b) run 'python configfiletool.py' to generate config.ini in local
       run '$sudo config_controller --config-file config.ini' on
       controller.

    Impact: compatibility with old *.ini configure file.

    Closes-bug: 1805320

    Change-Id: Ie96318357d5598be129567884ee662e991d46466
    Signed-off-by: SidneyAn <email address hidden>