containerd: include zfs plugin by default

Signed-off-by: Stephen J Day <stephen.day@docker.com>

vendor/github.com/mistifyio/go-zfs/utils_solaris.go

@@ -0,0 +1,17 @@
+// +build solaris
+
+package zfs
+
+import (
+	"strings"
+)
+
+// List of ZFS properties to retrieve from zfs list command on a Solaris platform
+var dsPropList = []string{"name", "origin", "used", "available", "mountpoint", "compression", "type", "volsize", "quota", "referenced"}
+
+var dsPropListOptions = strings.Join(dsPropList, ",")
+
+// List of Zpool properties to retrieve from zpool list command on a non-Solaris platform
+var zpoolPropList = []string{"name", "health", "allocated", "size", "free", "readonly", "dedupratio"}
+var zpoolPropListOptions = strings.Join(zpoolPropList, ",")
+var zpoolArgs = []string{"get", "-p", zpoolPropListOptions}