terraform: add block_device support to resource_aws_launch_configuration

[jschneiderhan]

Adds the ability to define block_device entries on resource_aws_launch_configurations.

Note, this is dependent on an open PR in the mitchell/goamz repo mitchellh/goamz#210.

This should address #756.

[statik]

👍 Is there anything I can do to to help with this? I need block devices in autoscaling groups for a project and don't want to drop back to using CloudFormation instead of terraform.

[jschneiderhan]

BTW most of the changes in this PR are copied over from the resource_aws_instance resource.

[jschneiderhan]

mitchellh/goamz#210 was merged into master, so I'm removing the DON'T MERGE prefix of the PR title.

[jwaldrip]

@statik agreed. Is there anything I can do to get this over the finishline?

[jwaldrip]

Fixed merge conflicts, see: #1271

[jschneiderhan]

Closing this - #1271 is the proper PR

[ghost]

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