Fcntl setting improvement,

[tymoteuszblochmobica]

Summary of changes

Improve getting/setting O_NONBLOCK option in fcntl() implement to provide stable file handle based socket operations.

Impact of changes

No impact

Migration actions required

Not needed

Documentation

None

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Pull request type

[x] Patch update (Bug fix / Target update / Docs update / Test update / Refactor)
[] Feature update (New feature / Functionality change / New API)
[] Major update (Breaking change E.g. Return code change / API behaviour change)

---

Test results

[] No Tests required for this change (E.g docs only update)
[x] Covered by existing mbed-os tests (Greentea or Unittest)
[] Tests / results supplied as part of this PR

---

Reviewers

@pan-
@ATmobica

[ciarmcom]

@tymoteuszblochmobica, thank you for your changes.
@pan- @ARMmbed/mbed-os-maintainers please review.

[ciarmcom]

@tymoteuszblochmobica, thank you for your changes.
@ARMmbed/mbed-os-maintainers please review.

[0xc0170]

@tymoteuszblochmobica Please add details to the commit message, it helps a reader to understand it better (I do not know what was wrong before and how it is being addressed here).

Pull request has been modified.

[0xc0170]

CI started

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jenkins-ci/mbed-os-ci_unittests	✔️
jenkins-ci/mbed-os-ci_build-cloud-example-ARM	✔️
jenkins-ci/mbed-os-ci_cmake-cloud-example-ARM	✔️
jenkins-ci/mbed-os-ci_build-cloud-example-GCC_ARM	✔️
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jenkins-ci/mbed-os-ci_cmake-example-ARM	✔️
jenkins-ci/mbed-os-ci_cmake-example-GCC_ARM	✔️
jenkins-ci/mbed-os-ci_build-example-GCC_ARM	✔️
jenkins-ci/mbed-os-ci_build-example-ARM	✔️
jenkins-ci/mbed-os-ci_greentea-test	✔️

[pan-]

@0xc0170 Anything else you need from us ?

[0xc0170]

All good, I'll take care of travis (reopening this PR) and we should be green.