Vendor psutils and remove neko

plugins/system/ps/load/load_linux.go

@@ -0,0 +1,40 @@
+// +build linux
+
+package load
+
+import (
+	"io/ioutil"
+	"strconv"
+	"strings"
+)
+
+func LoadAvg() (*LoadAvgStat, error) {
+	filename := "/proc/loadavg"
+	line, err := ioutil.ReadFile(filename)
+	if err != nil {
+		return nil, err
+	}
+
+	values := strings.Fields(string(line))
+
+	load1, err := strconv.ParseFloat(values[0], 64)
+	if err != nil {
+		return nil, err
+	}
+	load5, err := strconv.ParseFloat(values[1], 64)
+	if err != nil {
+		return nil, err
+	}
+	load15, err := strconv.ParseFloat(values[2], 64)
+	if err != nil {
+		return nil, err
+	}
+
+	ret := &LoadAvgStat{
+		Load1:  load1,
+		Load5:  load5,
+		Load15: load15,
+	}
+
+	return ret, nil
+}