Code review comment for lp:~xianghui/charm-helpers/support-ipv6

> Hui, I'm getting some lint errors:
>
> $ make lint
> Checking for Python syntax...
> charmhelpers/contrib/hahelpers/cluster.py:183:25: F821 undefined name
> 'get_ipv6_addr'
> charmhelpers/cli/commands.py:1:1: F401 'CommandLine' imported but unused
> charmhelpers/cli/commands.py:2:1: F401 'host' imported but unused
> tests/contrib/network/test_ip.py:161:78: W291 trailing whitespace
> make: *** [lint] Error 1
>
> Also, could you please update/add unit tests to cover the change you are
> making.

I don't know why the conflict deleted new added function "get_ipv6_addr()", will added on next patch, and except this error, other errors are not caused by my changes, if these strict lint rules applied to everyone?thanks.