Configurable node inventory sync interval
Configurable node inventory sync interval

tendrl-bug-id: Tendrl/node-agent#516
r0h4n/node-agent,r0h4n/node-agent,Tendrl/node_agent,Tendrl/node-agent,Tendrl/node-agent,Tendrl/node_agent,r0h4n/node-agent,Tendrl/node-agent