func NewTransaction(bridge string) *Transaction {
	return &Transaction{bridge: bridge}
}
NewTransaction begins a new OVS transaction for a given bridge. If an error
occurs at any step in the transaction, it will be recorded until
EndTransaction(), and any further calls on the transaction will be ignored.
package ovs
import (
	"fmt"
	"strings"
	"github.com/openshift/openshift-sdn/pkg/exec"
)
type Transaction struct {
	bridge string
	err    error
}