Fix nasa#497, Suppress ignored return value warning in codeSonar

[myc-yang]

Checklist (Please check before submitting)

• I reviewed the Contributing Guide.
• I signed and emailed the appropriate Contributor License Agreement to GSFC-SoftwareRelease@mail.nasa.gov and copied cfs-program@lists.nasa.gov.

Describe the contribution
In fsw/src/cf_cfdp.c in the function CF_CFDP_DisableEngine(), the return value of CFE_SB_DeletePipe() is ignored. Issue is captured in #497. I suppressed the warning by casting a (void) for the CFE_SB_DeletePipe() and putting a comment saying that codeSonar should ignore the warning.

Testing performed
I updated and ran the unit tests function Test_CF_CFDP_DisableEngine() in unit-test/cf_cfdp_tests.c,

Expected behavior changes

• None

System(s) tested on

• Hardware: PC
• OS: Ubuntu 18.04
• Versions: [e.g. cFE 6.6, OSAL 4.2, PSP 1.3 for mcp750, any related apps or tools]

Additional context
Add any other context about the contribution here.

Third party code
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Contributor Info - All information REQUIRED for consideration of pull request
Michael Yang NASA/GSFC