add Erjang

Erjang is a JVM-based Erlang VM.

This enable to run Erjang on OSv.

[ tgrabiec - dropped modules.json change ]
Signed-off-by: Zvi Avraham <zvi@nivertech.com>
Signed-off-by: Tomasz Grabiec <tgrabiec@cloudius-systems.com>