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/features_mimic.go

@@ -0,0 +1,20 @@
+// +build !luminous
+
+package rbd
+
+// #include <rbd/librbd.h>
+import "C"
+
+const (
+	// FeatureOperations is the representation of RBD_FEATURE_OPERATIONS
+	// from librbd
+	FeatureOperations = uint64(C.RBD_FEATURE_OPERATIONS)
+
+	// FeatureNameOperations is the representation of
+	// RBD_FEATURE_NAME_OPERATIONS from librbd
+	FeatureNameOperations = C.RBD_FEATURE_NAME_OPERATIONS
+)
+
+func init() {
+	featureNameToBit[FeatureNameOperations] = FeatureOperations
+}