Closes #544
The above issue describes a situation where using the bridge plugin
with IPv6 addresses prevented `DEL` from working correctly.
`DEL` seems to be failing in the body of `TeardownIPMasq`
This arises because:
* twice delete postrouting rules: `ipn.String()` `ipn.IP.String()` #279
* we are using a version of go-iptables which is bugged for v6
PR github.com/coreos/go-iptables/pull/74 describes why this does
not work. The error message is not being checked correctly.
Using a later version of go-iptables means that
* when the second `ipt.Delete` fails (this is okay)
* we will correctly interpret this as an non-fatal error
* `TeardownIPMasq` will not prematurely exit the method
* `ipt.ClearChain` now can run
* `ipt.DeleteChain` now can run
This explains why this was working for v4 but not v6
This commit was amended to include v0.5.0 instead of a pseudo-version
v0.4.6-0.20200318170312-12696f5c9108
Signed-off-by: toby lorne <toby@toby.codes>
23a1d90e0b