Implementation of JUnit test cases for value property related classes.

Implementation of JUnit test cases for value property related classes.

1. Implementation of JUnit test cases for IntegerProperty, DoubleProperty,
BooleanProperty, StringProperty, ArrayProperty and ModelProperty classes.
2. Applied IoTivity Java code style formatter to all JUnit test case files.

Change-Id: I4a0c2afcc0bde0c752e96f01b562dba7754764b4
Signed-off-by: Harish Kumara Marappa <h.marappa@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/5115
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Madan Lanka <lanka.madan@samsung.com>