The "common_types.h" file will no longer provide these.

Improve the error codes from this function.

- Introduces a new error "OS_ERR_OUTPUT_TOO_LARGE" if the size
limit was insufficient (instead of OS_SUCCESS).
- Return OS_ERROR if an empty file was written - this likely
indicates some fundamental issue with the VxWorks symbol table.
- Return OS_ERR_NAME_TOO_LONG if one of the symbol names was
too long, (instead of generic OS_ERROR).

Improve unit test to check for/verify these responses.

Merge branches 'fix831-add_bsd_sockets_coverage', 'fix846-code_review_minor_cleanup', 'fix-888-symEach-errs' and 'fix-843-endian-cleanup' into sa-20210323