lang: Initial implementation of the mgmt language

This is an initial implementation of the mgmt language. It is a
declarative (immutable) functional, reactive, domain specific
programming language. It is intended to be a language that is:

* safe
* powerful
* easy to reason about

With these properties, we hope this language, and the mgmt engine will
allow you to model the real-time systems that you'd like to automate.

This also includes a number of other associated changes. Sorry for the
large size of this patch.

lib/hello.go

@@ -0,0 +1,48 @@
+// Mgmt
+// Copyright (C) 2013-2018+ James Shubin and the project contributors
+// Written by James Shubin <james@shubin.ca> and the project contributors
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+package lib
+
+import (
+	"log"
+	"os"
+	"time"
+
+	"github.com/coreos/pkg/capnslog"
+)
+
+func hello(program, version string, flags Flags) {
+	var start = time.Now().UnixNano()
+
+	var logFlags int
+	if flags.Debug || true { // TODO: remove || true
+		logFlags = log.LstdFlags | log.Lshortfile
+	}
+	logFlags = (logFlags - log.Ldate) // remove the date for now
+	log.SetFlags(logFlags)
+
+	// un-hijack from capnslog...
+	log.SetOutput(os.Stderr)
+	if flags.Verbose {
+		capnslog.SetFormatter(capnslog.NewLogFormatter(os.Stderr, "(etcd) ", logFlags))
+	} else {
+		capnslog.SetFormatter(capnslog.NewNilFormatter())
+	}
+
+	log.Printf("This is: %s, version: %s", program, version)
+	log.Printf("Main: Start: %v", start)
+}