This fix tries to address the issue raised in 26341
where multiple addresses in a bridge may cause `--fixed-cidr`
to not have the correct addresses.
The issue is that `netutils.ElectInterfaceAddresses(bridgeName)`
only returns the first IPv4 address.
This fix (together with the PR created in libnetwork )
changes `ElectInterfaceAddresses()` and `addresses()`
so that all IPv4 addresses are returned. This will allow the
possibility of selectively choose the address needed.
In `daemon_unix.go`, bridge address is chosen by comparing with
the `--fixed-cidr` first, thus resolve the issue in 26341.
This fix is tested manually, as is described in 26341:
```
brctl addbr cbr0
ip addr add 10.111.111.111/20 dev cbr0 label cbr0:main
ip addr add 10.222.222.222/12 dev cbr0 label cbr0:docker
ip link set cbr0 up
docker daemon --bridge=cbr0 --iptables=false --ip-masq=false --fixed-cidr=10.222.222.222/24
docker run --rm busybox ip route get 8.8.8.8 | grep -Po 'src.*'
src 10.222.222.0
```
This fix fixes 26341.
Signed-off-by: Yong Tang <yong.tang.github@outlook.com>
Upstream-commit: e9c4c513d11e6c3986f8858b9a11535d61cfdf74
Component: engine
Yong Tang
72db6e475a