Add StorageOS volume plugin

vendor/github.com/storageos/go-api/server_version.go

@@ -0,0 +1,28 @@
+package storageos
+
+import (
+	"context"
+	"encoding/json"
+	"net/http"
+
+	"github.com/storageos/go-api/types"
+)
+
+// ServerVersion returns the server's version and runtime info.
+func (c *Client) ServerVersion(ctx context.Context) (*types.VersionInfo, error) {
+
+	// Send as unversioned
+	resp, err := c.do("GET", "version", doOptions{context: ctx, unversioned: true})
+	if err != nil {
+		return nil, err
+	}
+	if resp.StatusCode != http.StatusOK {
+		return nil, newError(resp)
+	}
+	defer resp.Body.Close()
+	var version types.VersionInfo
+	if err := json.NewDecoder(resp.Body).Decode(&version); err != nil {
+		return nil, err
+	}
+	return &version, nil
+}