Made btcd and lnd arch changeable.
---
btcd_user: "{{node_user}}"
btcd_version: "v0.20.1-beta"
btcd_arch: "armv7"
btcd_tar_name: "btcd-linux-{{btcd_arch}}-{{btcd_version}}"
btcd_tar: "{{btcd_tar_name}}.tar.gz"
btcd_url: "https://github.com/btcsuite/btcd/releases/download/{{btcd_version}}/{{btcd_tar}}"
btcd_enable_txindex: true