build: Refactor JSON scanner for UserInstall
build: Refactor JSON scanner for UserInstall

This was tested using poky master,
after scon install was introduced.

Change-Id: I5e154eff8b5e669f0dc0992b93f32c1d595bb322
Bug: https://jira.iotivity.org/browse/IOT-524
Signed-off-by: Philippe Coval <ff46fec9739d31cce915aabcc3a7a2c00eee4d6c@osg.samsung.com>

iotivity/iotivity,rzr/iotivity,rzr/iotivity,iotivity/iotivity,rzr/iotivity,rzr/iotivity,iotivity/iotivity,iotivity/iotivity,iotivity/iotivity,iotivity/iotivity,rzr/iotivity,iotivity/iotivity,rzr/iotivity,iotivity/iotivity,rzr/iotivity