Add unitTest for RCSDiscoveryManager.

Add unitTest for RCSDiscoveryManager.

Change the class name "DiscoveryTask" to "RCSDiscoveryTask".

Add handling about move operator and copy operator and move constructor and copy constructor for "RCSDiscoveryTask" class.

Modify Sconscript to build RCSDiscoveryManager UnitTest.

Change-Id: If409727bab435f38dd1ef4846880bf1a0bab827a
Signed-off-by: doil.kwon <doil.kwon@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/2623
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Madan Lanka <lanka.madan@samsung.com>