Do not require cgroups capabilities on windows to run the integration tests.

Signed-off-by: David Calavera <david.calavera@gmail.com>

integration-cli/requirements_unix.go

@@ -0,0 +1,39 @@
+// +build !windows
+
+package main
+
+import (
+	"io/ioutil"
+	"path"
+
+	"github.com/docker/libcontainer/cgroups"
+)
+
+var (
+	CpuCfsPeriod = TestRequirement{
+		func() bool {
+			cgroupCpuMountpoint, err := cgroups.FindCgroupMountpoint("cpu")
+			if err != nil {
+				return false
+			}
+			if _, err := ioutil.ReadFile(path.Join(cgroupCpuMountpoint, "cpu.cfs_period_us")); err != nil {
+				return false
+			}
+			return true
+		},
+		"Test requires an environment that supports cgroup cfs period.",
+	}
+	CpuCfsQuota = TestRequirement{
+		func() bool {
+			cgroupCpuMountpoint, err := cgroups.FindCgroupMountpoint("cpu")
+			if err != nil {
+				return false
+			}
+			if _, err := ioutil.ReadFile(path.Join(cgroupCpuMountpoint, "cpu.cfs_quota_us")); err != nil {
+				return false
+			}
+			return true
+		},
+		"Test requires an environment that supports cgroup cfs quota.",
+	}
+)