add a gtest case into serverBuilder unittest of resource-encapsulation for testing...

add a gtest case into serverBuilder unittest of resource-encapsulation for testing nested attributes

new case of  unittest : SettingNestedAttributesIsSameToGettingNestedAttributes

A RCSResourceAttributes, itself could be value of a key-value pair like int, double, string and so on.
That means developers are able to nested structure when they make key-value pairs and it is possible to set up the following hierachy in attributes.

{
 "type": "Living Colors",
 "name": "LC 1",
 "modelid": "LC0015",
 "swversion": "1.0.3",

 "state": {
    "hue": 50000,
    "on": true,
    "effect": "none",
    "alert": "none",
    "bri": 200,
    "sat": 200,
    "ct": 500,
    "reachable": true,
    "colormode": "hs"
  }
}

Change-Id: Ifdf2fb41860ad7227753677741bf79c6709fbaa6
Signed-off-by: Rami Jung <rami.jung@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/2284
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Madan Lanka <lanka.madan@samsung.com>