webos-image: luna-service2=157 libpbnjson=21

:Release Notes:
Increase number simultaneous requests handled by luna-service2 hub.
Stability fixes in libpbnjson.

:Detailed Notes:
luna-service2: submissions/156..submissions/157
54c377c Fix multiple services registrations in luna-service2

libpbnjson: submissions/20..submissions/21
0393fe4 Add initialization of JValue::asNumber() return value
409f505 Add sanity check of a schema in createSchemaMap

:Testing Performed:
miniBAT

:QA Notes:

:Issues Addressed:
[GF-38721] Increase number simultaneous requests handled by
           luna-service2 server
[GF-40819] json schema reports wrong initialized state
[GF-37762] libpbnjson: JValue::asNumber<> does not initialize return
           value
[GF-41357] CCC: luna-service2=157 libpbnjson=21

Open-webOS-DCO-1.0-Signed-off-by: Mykola Kryvonos <mykola.kryvonos@lge.com>
Change-Id: Idd5195b8f9b606bfaa8c2b327440ee763b8e7716
Reviewed-on: https://g2g.palm.com/3611
Reviewed-by: Herb Kuta <herb.kuta@lge.com>
Tested-by: Herb Kuta <herb.kuta@lge.com>
Reviewed-by: Build Verification