Add SimpleClientServer App.

Add SimpleClientServer App.

Combines SimpleServer and SimpleClient into a single app.
If there are errors, return code is non-zero.

To build:
$ scons TARGET_TRANSPORT=IP SECURED=0 RELEASE=1 BUILD_JAVA=ON

To run:
$ export LD_LIBRARY_PATH="<iotivity>/out/linux/x86_64/release/"
$ java -cp java/examples-java/simpleclientserver/build/libs/simpleclientserver.jar:\
java/iotivity-linux/build/libs/iotivity-linux.jar org.iotivity.base.examples.SimpleClientServer ;\
echo result code = $?

Change-Id: I8f4bcd04ecd41518694b1e9901b7dcc84da4c6fd
Signed-off-by: Larry Sachs <larry.j.sachs@intel.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/16239
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: George Nash <george.nash@intel.com>
Reviewed-by: Rick Bell <richard.s.bell@intel.com>