rebase: use go-ceph v0.3.0

v0.3.0 adds support for rbd.FeatureSet that can be used to parse the
features of an RBD image. This will be used in the followup commit that
adds rbdVolume.getImageInfo().

Signed-off-by: Niels de Vos <ndevos@redhat.com>

vendor/github.com/ceph/go-ceph/rbd/errors.go

@@ -0,0 +1,62 @@
+package rbd
+
+/*
+#include <errno.h>
+*/
+import "C"
+
+import (
+	"errors"
+	"fmt"
+
+	"github.com/ceph/go-ceph/internal/errutil"
+)
+
+// revive:disable:exported Temporarily live with stuttering
+
+// RBDError represents an error condition returned from the librbd APIs.
+type RBDError int
+
+// revive:enable:exported
+
+func (e RBDError) Error() string {
+	errno, s := errutil.FormatErrno(int(e))
+	if s == "" {
+		return fmt.Sprintf("rbd: ret=%d", errno)
+	}
+	return fmt.Sprintf("rbd: ret=%d, %s", errno, s)
+}
+
+func getError(err C.int) error {
+	if err != 0 {
+		if err == -C.ENOENT {
+			return ErrNotFound
+		}
+		return RBDError(err)
+	}
+	return nil
+}
+
+// Public go errors:
+
+var (
+	// ErrNoIOContext may be returned if an api call requires an IOContext and
+	// it is not provided.
+	ErrNoIOContext = errors.New("RBD image does not have an IOContext")
+	// ErrNoName may be returned if an api call requires a name and it is
+	// not provided.
+	ErrNoName = errors.New("RBD image does not have a name")
+	// ErrSnapshotNoName may be returned if an aip call requires a snapshot
+	// name and it is not provided.
+	ErrSnapshotNoName = errors.New("RBD snapshot does not have a name")
+	// ErrImageNotOpen may be returnened if an api call requires an open image handle and one is not provided.
+	ErrImageNotOpen = errors.New("RBD image not open")
+	// ErrNotFound may be returned from an api call when the requested item is
+	// missing.
+	ErrNotFound = errors.New("RBD image not found")
+
+	// revive:disable:exported for compatibility with old versions
+	RbdErrorImageNotOpen = ErrImageNotOpen
+	RbdErrorNotFound     = ErrNotFound
+	// revive:enable:exported
+)