* Refactor netkeystore.c to make client and server code testable.
* Add a client test for setting new passwd and changing passwd.
* Exclude "." and ".." from reset_keystore().
* Change ServerCommand.executeCommand() to accept variable length of
arguments and add convert() to marshalling the args to bytes.
* Keystore.java is revised accordingly.
+ Use '\0' as the delimiter.
+ Allow whitespace character for keystore password.
In previous implementation, we use space as the delimiter. That
will stop user from using passphrase with whitespace character.