Changed C Samples to use correct adapter type

Changed C Samples to use correct adapter type

The  C Samples were broken as a result of changing
the samples for IPv6. Also, removed port 6298 from
unicast discovery query and replaced some printf()
with OC_LOG(). Removed Differentiation between
IPv4 and IPv6 in the samples.

Change-Id: I83859aaf468c991ca5406014359476d0f43d5745
Signed-off-by: Omkar Hegde <omkar.m.hegde@intel.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/1623
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Erich Keane <erich.keane@intel.com>