Added details on building/installing json-c from bundled source in git submodule.
Added details on building/installing json-c from bundled source in git submodule.

benmcclelland/kinetic-c,Seagate/kinetic-c,benmcclelland/kinetic-c,benmcclelland/kinetic-c,Kinetic/kinetic-c,Kinetic/kinetic-c,benmcclelland/kinetic-c,rcrane/kinetic-c,Seagate/kinetic-c,kinjalcpatel/kinetic-c,Seagate/kinetic-c,chenchongli/kinetic-c,benmcclelland/kinetic-c,rcrane/kinetic-c,chenchongli/kinetic-c,chenchongli/kinetic-c,kinjalcpatel/kinetic-c,kinjalcpatel/kinetic-c,Seagate/kinetic-c,kinjalcpatel/kinetic-c,chenchongli/kinetic-c,rcrane/kinetic-c,Kinetic/kinetic-c,Kinetic/kinetic-c,rcrane/kinetic-c