directory structure change to work with glide

glide has its own requirements. My previous workaround caused me some
code checkin errors. Need to fix this.

weed/util/bytes_pool_test.go

@@ -0,0 +1,41 @@
+package util
+
+import (
+	"testing"
+)
+
+func TestTTLReadWrite(t *testing.T) {
+	var tests = []struct {
+		n        int // input
+		expected int // expected result
+	}{
+		{0, -1},
+		{1, 0},
+		{1 << 4, 0},
+		{1 << 6, 1},
+		{1 << 8, 2},
+		{1 << 10, 3},
+		{1 << 12, 4},
+		{1 << 14, 5},
+		{1 << 16, 6},
+		{1 << 18, 7},
+		{1<<4 + 1, 1},
+		{1<<6 + 1, 2},
+		{1<<8 + 1, 3},
+		{1<<10 + 1, 4},
+		{1<<12 + 1, 5},
+		{1<<14 + 1, 6},
+		{1<<16 + 1, 7},
+		{1<<18 + 1, 8},
+		{1<<28 - 1, 12},
+		{1 << 28, 12},
+		{1<<28 + 2134, -1},
+		{1080, 4},
+	}
+	for _, tt := range tests {
+		actual := findChunkPoolIndex(tt.n)
+		if actual != tt.expected {
+			t.Errorf("findChunkPoolIndex(%d): expected %d, actual %d", tt.n, tt.expected, actual)
+		}
+	}
+}