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.

chasquid.go

@@ -60,6 +60,7 @@ func main() {
 	if err != nil {
 		glog.Fatalf("Error reading config")
 	}
+	config.LogConfig(conf)
 
 	// Change to the config dir.
 	// This allow us to use relative paths for configuration directories.