update c/common

Update containers common to the latest HEAD.  Some bug fixes in libimage
forced us to have a clearer separation between ordinary images and
manifest lists.  Hence, when looking up manifest lists without recursing
into any of their instances, we need to use `LookupManifestList()`.

Also account for some other changes in c/common (e.g., the changed order
in the security labels).

Further vendor the latest HEAD from Buildah which is required to get the
bud tests to pass.

Signed-off-by: Valentin Rothberg <rothberg@redhat.com>

vendor/github.com/Microsoft/hcsshim/internal/hcs/schema2/container.go

@@ -0,0 +1,34 @@
+/*
+ * HCS API
+ *
+ * No description provided (generated by Swagger Codegen https://github.com/swagger-api/swagger-codegen)
+ *
+ * API version: 2.1
+ * Generated by: Swagger Codegen (https://github.com/swagger-api/swagger-codegen.git)
+ */
+
+package hcsschema
+
+type Container struct {
+	GuestOs *GuestOs `json:"GuestOs,omitempty"`
+
+	Storage *Storage `json:"Storage,omitempty"`
+
+	MappedDirectories []MappedDirectory `json:"MappedDirectories,omitempty"`
+
+	MappedPipes []MappedPipe `json:"MappedPipes,omitempty"`
+
+	Memory *Memory `json:"Memory,omitempty"`
+
+	Processor *Processor `json:"Processor,omitempty"`
+
+	Networking *Networking `json:"Networking,omitempty"`
+
+	HvSocket *HvSocket `json:"HvSocket,omitempty"`
+
+	ContainerCredentialGuard *ContainerCredentialGuardState `json:"ContainerCredentialGuard,omitempty"`
+
+	RegistryChanges *RegistryChanges `json:"RegistryChanges,omitempty"`
+
+	AssignedDevices []Device `json:"AssignedDevices,omitempty"`
+}