This fix tries to improve error messages when IP address
autodetection fails, as is specified in 25141.
Previously, error messages only indicate that multiple IPs
exist when autodetection fails. In this fix, if one
interface consists of multiple addresses or multiple
interfaces consist of addresses, the error messages output
the address names and interface names so that end user could
take notice.
This fix is verified manually.
When multiple addresses exist on multiple interfaces:
```
$ sudo docker swarm init
Error response from daemon: could not choose an IP address
to advertise since this system has multiple addresses on different
interfaces (192.168.186.128 on ens33 and 192.168.100.199 on eth10)
- specify one with --advertise-addr
```
When multiple addresses exist on single interface:
```
$ sudo docker swarm init
Error response from daemon: could not choose an IP address
to advertise since this system has multiple addresses
on interface ens33 (192.168.186.128 and 192.168.55.199)
- specify one with --advertise-addr
```
This fix fixes 25141.
Signed-off-by: Yong Tang <yong.tang.github@outlook.com>
Upstream-commit: 59db01049ac6a8e54490565dc44661f780c13734
Component: engine
91f37c3194