Add a "%" operator in search method

:Release Notes:
Add a "%" operator (the prefix operator) in filter of search method

:Detailed Notes:
"%" operator is needed for searching data by prefix in non-indexed
fields (using filter method)

:Testing Performed:
Manual testing

:QA Notes:

:Issues Addressed:
ANG-664 [DB8] The "%" operator (the prefix operator) doesn't work when using
identical collator in find method.

Open-webOS-DCO-1.0-Signed-off-by: Andrii Motsok <andrii.motsok@lge.com>

Change-Id: I9c4efa2cdcfa15ad4dabb3df884fa12c6085bd83
Reviewed-on: https://g2g.palm.com/4661
Reviewed-by: DCO Verification
Reviewed-by: Oleksii Uratkin <oleksii.uratkin@lge.com>
Tested-by: Oleksii Uratkin <oleksii.uratkin@lge.com>