This routine deletes a security context. The gss_delete_sec_context routine
deletes the local data structures associated with the specified
security context, and may generate an output_token,
which when passed to the peer gss_process_context_token will
instruct it to do likewise. No further security services may be
obtained using the context specified by context_handle.
The output_token argument is retained
for compatibility with Version 1 of the GSSAPI. It is recommended that
both peer applications invoke gss_delete_sec_context passing
the value GSS_C_NO_BUFFER for the output_token argument,
indicating that no token is required, and that gss_delete_sec_context should simply
delete local context data structures.