Reset signal handler on SIGINT to the original one once we receive SIGINT and start the termination.
Reset signal handler on SIGINT to the original one once we receive
SIGINT and start the termination.

This way we ensure termination handler is not potentially called
multiple times.

scalyr/scalyr-agent-2,imron/scalyr-agent-2,scalyr/scalyr-agent-2,scalyr/scalyr-agent-2,scalyr/scalyr-agent-2