netutils/dhcpc : do not send decline message to same dhcp server
netutils/dhcpc : do not send decline message to same dhcp server

This commit is bug fix to prevent send decline message
 - dhcp declient message is used to announce duplicated
   assigned IP address in a network
 - dhcp client doesn't have routine to check duplicate IP
   via ARP, so no need to send decline message to same server

Change-Id: Iae6036e064d767159fa6d1b6a10f95fcaa3c317f
Signed-off-by: Jin-Seong Kim <c7ef485e0ddc445bcfb224daa3f265bce32dcc94@samsung.com>

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