Support specifying memory on container-create

[hongbin]

Docker support an option to specify memory limit:

$ docker create --help

Usage: docker create [OPTIONS] IMAGE [COMMAND] [ARG...]

Create a new container

  ...
  -m, --memory="" Memory limit (format: <number><optional unit>, where unit = b, k, m or g)
  ...

Magnum needs this option on "magnum container-create". This will help for the capability planning and autoscaling.

[hongbin (hongbin034)]

@Vilobh, do you have cycle to revisit this bug? We need it for the autoscaling feature.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/229645

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/229645
Committed: https://git.openstack.org/cgit/openstack/magnum/commit/?id=454911f8308f672b5c4499fd4958a157929dc78d
Submitter: Jenkins
Branch: master

commit 454911f8308f672b5c4499fd4958a157929dc78d
Author: Hongbin Lu <email address hidden>
Date: Wed Sep 30 17:33:48 2015 -0400

    Allow container memory size to be specified

    With docker, users have an option to specify memory size when
    creating containers. This patch bring this capability to Magnum.
    Specifying memory size is optional but recommended. If memory size
    is unset, magnum will set mem_limit as None on docker create.

    Change-Id: Ife88284402ff39a7b2e051f6e66913e502f2ba8c
    Closes-Bug: #1487224

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/232175

[OpenStack Infra (hudson-openstack)]

Change abandoned by Hongbin Lu (<email address hidden>) on branch: master
Review: https://review.openstack.org/232175
Reason: According to the feedback from team members, quickstart guide is not a good place to document the memory option. Abandon this patch.