[JIRA IOT-780,782,783] fixed an error logic in sampleApp of Resource-Encapsulation.

[JIRA IOT-780,782,783] fixed an error logic in sampleApp of Resource-Encapsulation.

-When server is created for Light-Sensor,the server can't response for Get-Request.
-When user inserts invalid input, sample app was not work normally.
-Fixed sampleApp input logics.

Change-Id: I94d1ba4b1293f730ba185af847976b0e9d13d816
Signed-off-by: Heewon Park <h_w.park@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/3475
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Uze Choi <uzchoi@samsung.com>