osl: Unix pipe converted from OSL_ASSERT to assert/SAL_WARNs

Explanation for each conversion:

- osl_acceptPipe()
    - don't worry about an invalid oslPipe sent as function parameter an
      error gets flagged in Unix normally, so it might not be a
      programming error
    - definitely assert on an empty name, that's a definite programming
      error and should never, ever occur
    - createPipeImpl() allocates and initializes memory for the
      oslPipeImpl structure, if it can't do this then something has been
      done wrongly

- osl_receivePipe()
    - invalid oslPipe sent as function parameter might not be a
      programming error, give a warning but don't assert

- osl_sendPipe()
    - invalid oslPipe sent as function parameter might not be a
      programming error, give a warning but don't assert

- osl_writePipe()
    - really just a thin wrapper around osl_sendPipe(), which detects
      and handles invalid pipes

- osl_readPipe()
    - really just a thin wrapper around osl_receivePipe(), which detects
      and handles invalid pipes

Change-Id: I4923265b4c648852743c406b682d43ffb9ac6537
Reviewed-on: https://gerrit.libreoffice.org/40003
Reviewed-by: Chris Sherlock <chris.sherlock79@gmail.com>
Tested-by: Chris Sherlock <chris.sherlock79@gmail.com>

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