wrap boto.utils.get_instance_metadata to ensure non-lazy loading

newer versions of boto lazily load the metadata from the ec2
metadata service. Here, we:

1. Add a ec2_utils module that checks which version of boto is being used and
   under the right versions the metadata dictionary will be expanded.
2. Use this new ec2_utils module in the cloudstack and ec2
   datasources as there entrypoints into boto.
3. Add a dependency on python-pkg-resources (from pkg_resources import
   parse_version) to determine the boto version.

LP: #1068801

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