Add Debug Bitcoind RPC check & info

[rootzoll]

Use curl -u raspibolt:[PASSWORDB] --data-binary '{"jsonrpc": "1.0", "id":"curltest", "method": "getblockchaininfo", "params": [] }' -H 'content-type: text/plain;' http://127.0.0.1:8332/ to check if Bitcoin RPC is running & status info

[geco91]

recommed tagging for error analysis and pushing to RaspiBlitz v1.12.x