Fixed sample when command line argument exceeds 3

Fixed sample when command line argument exceeds 3

Fix IOT Bug 306. Updated simpleclient to exit and display help
message when command line arguments exceeds 3

Change-Id: I06d0692f9ee34f3fe8f2b0d08005770983838028
Signed-off-by: Shilpa Sodani <shilpa.a.sodani@intel.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/306
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Sashi Penta <sashi.kumar.penta@intel.com>
Reviewed-by: Yuliya Kamatkova <yuliya.kamatkova@intel.com>
Reviewed-by: Sudarshan Prasad <sudarshan.prasad@intel.com>
Tested-by: Sudarshan Prasad <sudarshan.prasad@intel.com>