Sigterm instead of Sigkill (#1687)

Co-authored-by: Dominic Wong <domwongemail@googlemail.com>
Co-authored-by: Asim Aslam <asim@aslam.me>

runtime/local/process/os/os.go

@@ -68,8 +68,7 @@ func (p *Process) Kill(pid *process.PID) error {
 
 	// now kill it
 	// using -ve PID kills the process group which we created in Fork()
-	return syscall.Kill(-id, syscall.SIGKILL)
-
+	return syscall.Kill(-id, syscall.SIGTERM)
 }
 
 func (p *Process) Wait(pid *process.PID) error {