[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
Merge pull request #2384 from jbence/feature/AWS_support_indexed_params_describe_images

[aws|compute]: Add index for describe_images parameters that use them
Sometimes :Environments is not a key
[bluebox] remove :host from excon request
[vcloud_director] fix models vms_test so is pending on empty environment
[aws|sqs] remove host/port from request

see #2284
Merge pull request #2386 from blueboxgroup/bluebox

[bluebox] remove :host from excon request
Merge pull request #2385 from moneypenny/master

fix Terremark ecloud environments nil reference
Merge pull request #2383 from alphagov/vms_test_fix_empty_env

[vcloud_director] fix vms_tests to be pending when run on empty environment
[AWS] add modify_vpc_attribute