add ipv6_only support to blue box
some ipv6_only corrections
Update Amazon instance flavors
Fix syntax issue
Fix syntax issue
Correct another syntax issue
Add cpu_speed to flavors
Revert excon version back
Added tablet device to default template to fix VNC and Mouse pointer position
[google] natIP is set to true when it must be an ip

As described in https://developers.google.com/compute/docs/reference/latest/instances networkInterfaces[].accessConfigs[].natIP
Fixes Fog::Errors::Error: Invalid value for field 'resource.networkInterfaces[0].accessConfigs[0].natIP': 'true'.  Must be an IP address
[google] Add support for instance tags
[Brightbox] Add new SSL cert metadata attributes

Now adding `valid_from` and `issuer` to model
Merge pull request #2376 from brightbox/add_new_ssl_metadata

[Brightbox] Add new SSL cert metadata attributes
[aws|elb] support for cross zone load balancing
Merge pull request #2377 from maestrodev/google-natip

[google|compute] natIP is set to true when it must be an ip
[google] Add support for instance tags
Merge pull request #2378 from maestrodev/google-tags

[google|compute] Add support for instance tags
[aws] narrow scope of unf warning

see #2320
Merge pull request #2380 from fcheung/elb_modify_attributes

[aws|elb] support for cross zone load balancing
Add index for describe_images parameters that use them