Fix #450: Do not use an IP resolution method different than the one specified in configuration.

[fdcastel]

As per this comment on #450.

There are 3 methods of IP resolution, in order of priority:

• get_address_cmd()
• get_address_iface()
• get_address_remote()

Changes in source code:

• Moves the checks for "is this method configured?" to outside of get_address_cmd() and get_address_iface();
• When found one method configured stops looking for other methods if an error occurs;
• get_address_remote() (the latest, in order) is unchanged.

[troglobit]

Nice work!