Fix OcPlatform.Configure() to ensure start() is called properly

Fix OcPlatform.Configure() to ensure start() is called properly

Fixes [IOT-1908].

The recent commit of https://gerrit.iotivity.org/gerrit/#/c/17685/
requires OcPlatform.start() be called after OcPlatform.configure()

Change-Id: I5b721ff24c4b673b5741c14f4c7ed3331b9e536d
Signed-off-by: Larry Sachs <larry.j.sachs@intel.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/17809
Tested-by: jenkins-iotivity <jenkins@iotivity.org>
Reviewed-by: George Nash <george.nash@intel.com>
Reviewed-by: jihwan seo <jihwan.seo@samsung.com>
Reviewed-by: Rick Bell <richard.s.bell@intel.com>