monitor:JSON: Enable JSON configuration file usage

Add the support to enable the use of a JSON configuration file at
configure time using the same `enable_json` flag along with the
appropriate makefile attributes to compile in the JSON configuration
file support.

Tested:
    `--enable-json` configure flag enables use of JSON in place of YAML
    YAML build time configuration used when `--enable-json` not given
    JSON configuration file loaded/parsed/used when enabled

Change-Id: Ie869b245df533d2a3656543f8ce370d9d24cf4ce
Signed-off-by: Matthew Barth <msbarth@us.ibm.com>
2 files changed