Signal handling logs should be in "debug"
Signal handling logs should be in "debug"

tendrl-bug-id: Tendrl/commons#575
Tendrl/node-agent,Tendrl/node-agent,Tendrl/node-agent,r0h4n/node-agent,r0h4n/node-agent,Tendrl/node_agent,r0h4n/node-agent,Tendrl/node_agent