Fixes and improvements to bt and drippy scripts

• Fix bs4 constructor args, now uses xml
• Add verbosity option for hcitool commands
• Output errors
• Implement graceful shutdown for GpsPoller
• GpsPoller now opens UNIX socket instead of using GPS lib

requested review from @hamro777 and @andgu38

assigned to @elmzi904

changed the description

added 1 commit

• 139b0ea6 - Fixes and improvements to bt and drippy scripts

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mentioned in commit 26a2926a

merged