[connman] try connecting to failure state service.

Tries at least once regardless, if there still is invalid-key error,
send User Input Requested via agent. If user cancels that request,
stop trying to connect.

This helps when a wireless AP with same ssid/enc but unknown
comes within range. connman issues an invalid-key, as the passwords
are different. Which would cause connman to not try and connect when the
good, known AP comes within range.