Support multiline replies in OSInfo

[GF-3209] Implement NYX_OS_INFO_CORE_OS_KERNEL_*

Open-webOS-DCO-1.0-Signed-off-by: Pekka Ropo <pekka.ropo@palm.com>

Change-Id: I80886dd196dc01ef31a5990698cb221fc4acf418
Reviewed-on: https://g2g.palm.com/1922
Reviewed-by: Build Verification
Reviewed-by: Pekka Ropo <pekka.ropo@palm.com>
Tested-by: Pekka Ropo <pekka.ropo@palm.com>
Reviewed-by: Keith Derrick <keith.derrick@lge.com>