Increase delay in presence notifications to avoid stability issues.

Increase delay in presence notifications to avoid stability issues.

The C sample server, ocserver.cpp had a delay of 5 seconds before
sending out presence notifications. Failing to start the client would
cause missed notifications.
Increased delay to avoid false stability issues when testing.
This addresses IOT-546.

Change-Id: I2c9a7810d71886ff3abe7024c1f583bcd4ab65c5
Signed-off-by: Mandeep Shetty <mandeep.shetty@intel.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/1215
Reviewed-by: Mark Tung <mark.y.tung@intel.com>
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Doug Hudson <douglas.hudson@intel.com>
Reviewed-by: Erich Keane <erich.keane@intel.com>