Fixes for these are either rewriting to get rid of the need for the
functions or using six.moves to get equivalent functions for both
python2 and python3
To support parallel cloud test execution, create and provide a random string to
cloud integration tests. The variable 'resource_prefix' can be used in cloud
roles and during resource cleanup to safely create/destroy cloud-based
resources.
Additional changes include:
* The roles test_ec2_key and test_ec2_group were updated to use to
{{resource_prefix}}.
* Additionally, the Makefile was updated to set resource_prefix to a random
string. The Makefile will also use 'resource_prefix' during cloud_cleanup.
* All test_ec2* roles were updated to add 'setup_ec2' as a role dependency.
