Update incorrect license for dc_api.py

[Cole Walker]

Brief Description
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A more detailed open source license header is required for dc_api.py

Severity
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Provide the severity of the defect.
Minor

Steps to Reproduce
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Write down the steps to reproduce the issue

Expected Behavior
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Write down what was expected after taking the steps written above

Actual Behavior
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State what is the actual behavior

Reproducibility
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<Reproducible/Intermittent/Seen once>
State if the issue is 100% reproducible, intermittent or seen once. If it is intermittent, state the frequency of occurrence

System Configuration
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<One node system, Two node system, Multi-node system, Dedicated storage, https, IPv4, IPv6 etc.>

Branch/Pull Time/Commit
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Branch and the time when code was pulled or git commit or cengn load info

Last Pass
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Did this test scenario pass previously? If so, please indicate the load/pull time info of the last pass.
Use this section to also indicate if this is a new test scenario.

Timestamp/Logs
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Attach the logs for debugging (use attachments in Launchpad or for large collect files use: https://files.starlingx.kube.cengn.ca/)
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Please indicate the unique identifier in the logs to highlight the problem

Test Activity
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[Sanity, Feature Testing, Regression Testing, Developer Testing, Evaluation, Other - Please specify]

Workaround
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Describe workaround if available

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.opendev.org/c/starlingx/config/+/844499

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/c/starlingx/config/+/844499
Committed: https://opendev.org/starlingx/config/commit/318080117e423ab7faa1bb951700d42ff4d24ed3
Submitter: "Zuul (22348)"
Branch: master

commit 318080117e423ab7faa1bb951700d42ff4d24ed3
Author: Cole Walker <email address hidden>
Date: Thu Jun 2 12:08:16 2022 -0400

    Update license file with a detailed open source license

    A review of license headers has requested that this file be updated with
    a more detailed header. Updating to comply with this request.

    Closes-Bug: 1977137

    Signed-off-by: Cole Walker <email address hidden>
    Change-Id: If0ddac59e789fc66ca70225bd7632c68769cfce1