If Bitcoin's already running, check if it's on the target version

[bitcoin-tools]

Before launching Bitcoin, check if it's already running:

• if Bitcoin isn't running do the status quo (launch bitcoin)
• if Bitcoin is running, check the version
  • if it's on the target version, don't launch it again
  • if it's not on the target version, stop the current pid via bitcoin-cli, wait for it to stop, then do the status quo (launch bitcoin).