Turn chasquid-userdb into chasquid-util

This patch removes chasquid-userdb and adds a more generic and extensive
chasquid-util, that supports various operations on user databases as well as
aliases lookups.

The code is not very pretty but for now I took a more practical approach, the
tool is ancillary and can be tidied up later.

internal/aliases/aliases.go

@@ -69,11 +69,11 @@ type Recipient struct {
 	Type RType
 }
 
-type RType int
+type RType string
 
 const (
-	EMAIL RType = iota
-	PIPE
+	EMAIL RType = "(email)"
+	PIPE  RType = "(pipe)"
 )
 
 var (

internal/config/config.go

@@ -62,11 +62,10 @@ func Load(path string) (*Config, error) {
 		c.DataDir = "/var/lib/chasquid"
 	}
 
-	logConfig(c)
 	return c, nil
 }
 
-func logConfig(c *Config) {
+func LogConfig(c *Config) {
 	glog.Infof("Configuration:")
 	glog.Infof("  Hostname: %q", c.Hostname)
 	glog.Infof("  Max data size (MB): %d", c.MaxDataSizeMb)