Change test data generator to create string cpumasks.

Docker-DCO-1.1-Signed-off-by: Rohit Jnagal <jnagal@google.com> (github: rjnagal)

info/test/datagen.go

@@ -16,7 +16,6 @@ package test
 
 import (
 	"fmt"
-	"math"
 	"math/rand"
 	"time"
 
@@ -59,12 +58,7 @@ func GenerateRandomContainerSpec(numCores int) *info.ContainerSpec {
 	}
 	ret.Cpu.Limit = uint64(1000 + rand.Int63n(2000))
 	ret.Cpu.MaxLimit = uint64(1000 + rand.Int63n(2000))
-	n := (numCores + 63) / 64
-	ret.Cpu.Mask.Data = make([]uint64, n)
-	for i := 0; i < n; i++ {
-		ret.Cpu.Mask.Data[i] = math.MaxUint64
-	}
-
+	ret.Cpu.Mask = fmt.Sprintf("0-%d", numCores-1)
 	ret.Memory.Limit = uint64(4096 + rand.Int63n(4096))
 	return ret
 }