Feature/filestorage sharenetworks create (#118)

* sfs: Add support for share networks Create

* sfs: Add Manila to acceptance test environment

* sfs: Add acceptance tests for share networks Create

* sfs: Remove unused urls

Some url functions were introduced but they belong to other
PRs. Will be repushed with in the correct PRs

* sfs: Make name and descr required for creating share network

* sfs: Remove required parameters

After taking a close look at the code it appeared that 'name'
and 'description' are not required parameters
diff --git a/openstack/sharedfilesystems/v2/sharenetworks/results.go b/openstack/sharedfilesystems/v2/sharenetworks/results.go
new file mode 100644
index 0000000..9a2891a
--- /dev/null
+++ b/openstack/sharedfilesystems/v2/sharenetworks/results.go
@@ -0,0 +1,52 @@
+package sharenetworks
+
+import "github.com/gophercloud/gophercloud"
+
+// ShareNetwork contains all the information associated with an OpenStack
+// ShareNetwork.
+type ShareNetwork struct {
+	// The Share Network ID
+	ID string `json:"id"`
+	// The UUID of the project where the share network was created
+	ProjectID string `json:"project_id"`
+	// The neutron network ID
+	NeutronNetID string `json:"neutron_net_id"`
+	// The neutron subnet ID
+	NeutronSubnetID string `json:"neutron_subnet_id"`
+	// The nova network ID
+	NovaNetID string `json:"nova_net_id"`
+	// The network type. A valid value is VLAN, VXLAN, GRE or flat
+	NetworkType string `json:"network_type"`
+	// The segmentation ID
+	SegmentationID int `json:"segmentation_id"`
+	// The IP block from which to allocate the network, in CIDR notation
+	CIDR string `json:"cidr"`
+	// The IP version of the network. A valid value is 4 or 6
+	IPVersion int `json:"ip_version"`
+	// The Share Network name
+	Name string `json:"name"`
+	// The Share Network description
+	Description string `json:"description"`
+	// The date and time stamp when the Share Network was created
+	CreatedAt string `json:"created_at"`
+	// The date and time stamp when the Share Network was updated
+	UpdatedAt string `json:"updated_at"`
+}
+
+type commonResult struct {
+	gophercloud.Result
+}
+
+// Extract will get the ShareNetwork object out of the commonResult object.
+func (r commonResult) Extract() (*ShareNetwork, error) {
+	var s struct {
+		ShareNetwork *ShareNetwork `json:"share_network"`
+	}
+	err := r.ExtractInto(&s)
+	return s.ShareNetwork, err
+}
+
+// CreateResult contains the response body and error from a Create request.
+type CreateResult struct {
+	commonResult
+}