Fix Public IP detection - Fix issue when seeip.org is unreachable #1241

[ralphg6]

The script does work when seeip.org is unreachable, so I changed the policy to define the public IP.

It solves the issue #1241

CHANGELOG

Added

• Timeout limit on each try to solve the IP to avoid long waits;
• Extra public IP providers as failovers;

Changed

• the script only will try to solve an IP if the ENDPOINT is empty;

Removed

• Unneeded output of CURL commands on IP detection;
• Duplicated code;