.npmignore: add file to allow clean install in /usr/lib/node_modules
.npmignore: add file to allow clean install in /usr/lib/node_modules

Signed-off-by: Brendan Le Foll <3e0e8c4069934e8b47d99704927a85c66c0ceb33@intel.com>

enableiot/iotkit-agent,enableiot/iotkit-agent