Adds test package

This splits out the mock libvirt server for testing within
other packages. Constants from the main libvirt package
have been moved to a separate package, constants, for shared access.

internal/constants/constants.go

@@ -0,0 +1,54 @@
+// Copyright 2016 The go-libvirt Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Package constants provides shared data for the libvirt package.
+package constants
+
+// magic program numbers
+// see: https://libvirt.org/git/?p=libvirt.git;a=blob_plain;f=src/remote/remote_protocol.x;hb=HEAD
+const (
+	ProgramVersion   = 1
+	ProgramRemote    = 0x20008086
+	ProgramQEMU      = 0x20008087
+	ProgramKeepAlive = 0x6b656570
+)
+
+// libvirt procedure identifiers
+const (
+	ProcConnectOpen           = 1
+	ProcConnectClose          = 2
+	ProcDomainLookupByName    = 23
+	ProcAuthList              = 66
+	ProcConnectGetLibVersion  = 157
+	ProcConnectListAllDomains = 273
+)
+
+// qemu procedure identifiers
+const (
+	QEMUDomainMonitor                       = 1
+	QEMUConnectDomainMonitorEventRegister   = 4
+	QEMUConnectDomainMonitorEventDeregister = 5
+	QEMUDomainMonitorEvent                  = 6
+)
+
+const (
+	// PacketLengthSize is the packet length, in bytes.
+	PacketLengthSize = 4
+
+	// HeaderSize is the packet header size, in bytes.
+	HeaderSize = 24
+
+	// UUIDSize is the length of a UUID, in bytes.
+	UUIDSize = 16
+)