build: extract config-generated.go.in from Makefile

Makefile had a template for cli/config-generated.go embedded inside it.
There is already a templating mechanism for .in files.  Using a .in file
is cleaner since it avoids make's awkward interaction with shell
escaping and line splitting.

This patch moves the template into cli/config-generated.go.in and reuses
the existing .in file templating mechanism.  Only the PKGRUNDIR variable
needs to be added.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

cli/config-generated.go.in

@@ -0,0 +1,49 @@
+//
+// Copyright (c) 2018-2019 Intel Corporation
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+// WARNING: This file is auto-generated - DO NOT EDIT!
+//
+// Note that some variables are "var" to allow them to be modified
+// by the tests.
+package main
+
+import (
+	"fmt"
+)
+
+// name is the name of the runtime
+const name = "@RUNTIME_NAME@"
+
+// name of the project
+const project = "@PROJECT_NAME@"
+
+// prefix used to denote non-standard CLI commands and options.
+const projectPrefix = "@PROJECT_TYPE@"
+
+// original URL for this project
+const projectURL = "@PROJECT_URL@"
+
+const defaultRootDirectory = "@PKGRUNDIR@"
+
+// commit is the git commit the runtime is compiled from.
+var commit = "@COMMIT@"
+
+// version is the runtime version.
+var version = "@VERSION@"
+
+// project-specific command names
+var envCmd = fmt.Sprintf("%s-env", projectPrefix)
+var checkCmd = fmt.Sprintf("%s-check", projectPrefix)
+
+// project-specific option names
+var configFilePathOption = fmt.Sprintf("%s-config", projectPrefix)
+var showConfigPathsOption = fmt.Sprintf("%s-show-default-config-paths", projectPrefix)
+
+// Default config file used by stateless systems.
+var defaultRuntimeConfiguration = "@CONFIG_PATH@"
+
+// Alternate config file that takes precedence over
+// defaultRuntimeConfiguration.
+var defaultSysConfRuntimeConfiguration = "@SYSCONFIG@"