Fix load-import --local with proxy

[Lindley Werner Soares Vieira]

Brief Description
-----------------

In both cases below the load should succeed, but fails:

SUCCESS PATH: Load-import inactive with patch# + local parameter
system --os-region-name SystemController load-import --inactive *.iso *.sig --local
error msg: Load import failed. Reason: No valid upgrade path found

SUCCESS PATH: Load import active load + local parameter
cmd: system --os-region-name SystemController load-import --active .*iso *.sig --local
error:
This operation will take a while. Please wait.
..
Load import failed. Reason: Imported load exists.

Severity
--------
Critical: System/Feature is not usable due to the defect

Steps to Reproduce
------------------
Load-import inactive with 21.12P10/P11 + local parameter
Load import active load + local parameter

Expected Behavior
------------------
The load should succeed

Actual Behavior
----------------
The load fails

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

System Configuration
--------------------
DC

Branch/Pull Time/Commit
-----------------------

Last Pass
---------
New feature

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

Test Activity
-------------

Workaround
----------
load without using --os-region-name SystemController

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/c/starlingx/distcloud/+/900934
Committed: https://opendev.org/starlingx/distcloud/commit/c5e1d7c1319c52eae66ed04e63eb0378b0b59129
Submitter: "Zuul (22348)"
Branch: master

commit c5e1d7c1319c52eae66ed04e63eb0378b0b59129
Author: Lindley Werner <email address hidden>
Date: Tue Nov 14 15:15:43 2023 -0300

    Fix load-import --local with proxy

    When load-import is called with --local the load is imported locally
    from the active controller. When it's called with "--os-region-name
    SystemController", the request is intercepted by the dc-api-proxy.

    This commit fixes a bug that happens when the request is intercepted
    by the dc-api-proxy. When using --local, the function receives the
    params through "request.body" and when not using it the params come
    through request.POST. Only the second way was being treated.

    Test plan:
      PASS: load-import with --os-region-name SystemController,
      --inactive and --local should be completed if using an upgradable
      load
      PASS: load-import with --os-region-name SystemController,
      --inactive and --local should fail if using a non-upgradable load
      PASS: load-import with --os-region-name SystemController, --active,
      and --local should complete using a load from the same version
      PASS: load-import with --os-region-name SystemController and
      --inactive should be completed if using an upgradable load
      PASS: load-import with --os-region-name SystemController and
      --inactive should fail if using a non-upgradable load

    Closes-bug: 2043511

    Change-Id: Id5c02fdc35c43b4134fd34592de36d35f9fc88b6
    Signed-off-by: Lindley Werner <email address hidden>