Resize vector holding ip address to correct size

[jmccl]

Trivial change to resize the vector holding the ip address to the correct size. Without this the subsequent call to 'from_utf8' operates on a vector that is too large, resulting in garbage at the end of the string produced.

[bavshin-f5]

The change is correct, but not sufficient. If you do that, NgxHttpOrigDstCtx::save will attempt to copy IPV4_STRLEN bytes from the addr of length e, going past the end of the buffer.

[jmccl]

Good catch. I've updated the PR.

[bavshin-f5]

Looks good, thanks!

Do you mind squashing the commits and adding fix(examples): prefix.

[jmccl]

Done.

[bavshin-f5]

Thanks!