Add TrustId parameter to swift driver

github/ncw/swift has added support for trust, so let's add it.

Signed-off-by: Hua Wang <wanghua.humble@gmail.com>

docs/storage/driver/swift/swift.go

@@ -61,6 +61,7 @@ type Parameters struct {
 	TenantID           string
 	Domain             string
 	DomainID           string
+	TrustID            string
 	Region             string
 	Container          string
 	Prefix             string
@@ -156,6 +157,7 @@ func New(params Parameters) (*Driver, error) {
 		TenantId:       params.TenantID,
 		Domain:         params.Domain,
 		DomainId:       params.DomainID,
+		TrustId:        params.TrustID,
 		Transport:      transport,
 		ConnectTimeout: 60 * time.Second,
 		Timeout:        15 * 60 * time.Second,

docs/storage/driver/swift/swift_test.go

@@ -29,6 +29,7 @@ func init() {
 		tenantID           string
 		domain             string
 		domainID           string
+		trustID            string
 		container          string
 		region             string
 		insecureSkipVerify bool
@@ -42,6 +43,7 @@ func init() {
 	tenantID = os.Getenv("SWIFT_TENANT_ID")
 	domain = os.Getenv("SWIFT_DOMAIN_NAME")
 	domainID = os.Getenv("SWIFT_DOMAIN_ID")
+	trustID = os.Getenv("SWIFT_TRUST_ID")
 	container = os.Getenv("SWIFT_CONTAINER_NAME")
 	region = os.Getenv("SWIFT_REGION_NAME")
 	insecureSkipVerify, _ = strconv.ParseBool(os.Getenv("SWIFT_INSECURESKIPVERIFY"))
@@ -71,6 +73,7 @@ func init() {
 			tenantID,
 			domain,
 			domainID,
+			trustID,
 			region,
 			container,
 			root,