make public_ip work for any case 'none' at 'instance_access_configs_for'

[abhishekkr]

version in use: knife-google (2.0.0)

Running knife google server create ...--gce-public-ip none command still attached Ephemeral(default) public-ip to the new node.
Making match non-case-sensitive at 'google_service.rb:instance_access_configs_for' fixed it.

Here is the PR for it, also made it similar to 'valid_public_ip_setting?' handling of case.

[abhishekkr]

the error check is for Ruby 2.0.0

An error occurred while installing chef-zero (4.6.2), and Bundler cannot continue

[abhishekkr]

to re-run Travis

[hrez]

Thanks for the fix. Why isn't it still merged to the master? It's obviously a bug.

[jjasghar]

@abhishekkr can you rebase off master please?

[jjasghar]

With our new policy please use the DCO signing process.

For a detailed description or you can just do:

$ git commit -s
$ #Or
$ git commit --signoff

If you already have the commit, use git commit --amend or git rebase -i to edit your commit message, and add the above signoff line.

Or if you want a more perminant option the following is a way to set it forever:

$ git config commit.gpgsign true

[abhishekkr]

@jjasghar had already pushed required diffs before, so pushed in an empty commit signed

[abhishekkr]

@jjasghar do I need to do anything else

[jjasghar]

I'll be releasing a new version of the gem soon.

[jjasghar]

I have released v3.1.0