Merge pull request #346 from haklop/fix-pool-members

Add a missing omitempty on the CreateOpts struct of LBaaS members
diff --git a/openstack/networking/v2/extensions/lbaas/members/requests.go b/openstack/networking/v2/extensions/lbaas/members/requests.go
index 58ec580..2586584 100644
--- a/openstack/networking/v2/extensions/lbaas/members/requests.go
+++ b/openstack/networking/v2/extensions/lbaas/members/requests.go
@@ -63,7 +63,7 @@
 // load balancer pool member.
 func Create(c *gophercloud.ServiceClient, opts CreateOpts) CreateResult {
 	type member struct {
-		TenantID     string `json:"tenant_id"`
+		TenantID     string `json:"tenant_id,omitempty"`
 		ProtocolPort int    `json:"protocol_port"`
 		Address      string `json:"address"`
 		PoolID       string `json:"pool_id"`