vev: Log where MGT received its signal from #4139
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nigoroll
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In order to keep a pointer to the siginfo_t in struct vevsig in struct vev we need to define an opaque typedef to siginfo_t* since we do not want to include <signal.h> in vev.h
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This PR makes MGT log from which PID originates the signal it received.
It does that by adding the SIGINFO flag to sigaction in order to use
sa_sigactioninsead ofsa_handlerand grab thestruct siginfo_twhich contains the origin PID