artik053/nettest: enable netdb dns client
artik053/nettest: enable netdb dns client

This commit is to enable netdb dns client configuration
 - to fully support netdb library, dns client is needed

Change-Id: I25eb00b3d75fa6b85cdbf654089501c5074154f0
Signed-off-by: Jin-Seong Kim <c7ef485e0ddc445bcfb224daa3f265bce32dcc94@samsung.com>

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