Modified ocserver to make presence flow clearer.

Modified ocserver to make presence flow clearer.

C sample server ocserver.cpp had messages printed out on screen that
could be and were misinterpreted. Added messages to make what is going
on more obvious.

Change-Id: Ib21a83253527d763764f0294cbd82d45fafaebc3
Signed-off-by: Mandeep Shetty <mandeep.shetty@intel.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/748
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Sakthivel Samidurai <sakthivel.samidurai@intel.com>
Reviewed-by: Vijay Kesavan <vijay.s.kesavan@intel.com>