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/acceptance/openstack/sharedfilesystems/v2/sharenetworks_test.go b/acceptance/openstack/sharedfilesystems/v2/sharenetworks_test.go
new file mode 100644
index 0000000..6b74007
--- /dev/null
+++ b/acceptance/openstack/sharedfilesystems/v2/sharenetworks_test.go
@@ -0,0 +1,23 @@
+package v2
+
+import (
+	"testing"
+
+	"github.com/gophercloud/gophercloud/acceptance/clients"
+)
+
+func TestShareNetworkCreate(t *testing.T) {
+	client, err := clients.NewSharedFileSystemV2Client()
+	if err != nil {
+		t.Fatalf("Unable to create shared file system client: %v", err)
+	}
+
+	shareNetwork, err := CreateShareNetwork(t, client)
+	if err != nil {
+		t.Fatalf("Unable to create share network: %v", err)
+	}
+
+	// TODO: delete the share network when the delete is implemented
+
+	PrintShareNetwork(t, shareNetwork)
+}