Fix json_tokener_parse() error for unicode string

:Release Notes:
json_tokerner_parse() now accepts capital unicode string

:Detailed Notes:
Hex. characters include 1-9, a-f and A-F. But cjson does not include
A-F. That's why it json_tokener_parse() returns error on \u002F

:Testing Performed:
Checks whether json_tokener_parse() succeeded in strings "\u002F"

:QA Notes:

:Issues Addressed:
[ANG-6517] json_tokener_parse() returns error for unicode strings

Open-webOS-DCO-1.0-Signed-off-by: Junku Park <junku.park@lge.com>

Change-Id: Ibb1ceae421025b7b09cf18b84593f2dd2692b082
Reviewed-on: https://g2g.palm.com/5560
Reviewed-by: DCO Verification
Reviewed-by: Junku Park <junku.park@lge.com>
Tested-by: Junku Park <junku.park@lge.com>
Reviewed-by: Keith Derrick <keith.derrick@lge.com>