utils/bg-tool: add connections command; implement ps commands
utils/bg-tool: add connections command; implement ps commands

 - add 'ps dump' - dump all active keys
 - add 'ps defrag' - defragment flash
 - add 'ps clear' - delete all persistent store keys and reset
 - add 'connections' - dump information about active connections (if any)

hbock/bgasync