Design Changes to JsonSchema Parser

Design Changes to JsonSchema Parser

1. Changes to read Json Schema to read Simple Arrays and Array of Array of Properties required for Collection
2. Changes to read as Simple Attribute as vector of homogeneous values into Simulator Factory
3. Changes to Read the Properties from schema in a Unified Manner using ValueVariant to hold the values
4. Added Support to read Multiple ValueProperties for each property
5. Added support for Pattern, Format and Array ValueProperties.
6.Changes to read the referenced file in Json Schema from a single Implementation
7. Added Default values for attributes when not obtained from Schema

Change-Id: Iccc3a1cb0881d19b511cc743975299e85fd27c2d
Signed-off-by: Abitha Shankar <abitha.s@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/4755
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Radha Bhavani <radha.p@samsung.com>
Reviewed-by: Uze Choi <uzchoi@samsung.com>