examples/libcoap_client : trivial patch, update usages
examples/libcoap_client : trivial patch, update usages

This commit is trivial patch to update usages
 - delete not-supported options

Change-Id: Id9dee2add1866b0a748dcea6b8bafb5a81a427a3
Signed-off-by: Jin-Seong Kim <c7ef485e0ddc445bcfb224daa3f265bce32dcc94@samsung.com>

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