* Update testing policy to be correct for RDS test suite
* Create read replica in same region to avoid more permissions being
required
* Ensure modifying DB doesn't try to downgrade engine version
* Add tags to main test suite to limit number of tests run for problem
solving
* Combine testing policies
Because of the maximum of 10 policies per group, need to
consolidate testing policies as best we can.
* Tidy put-account-setting tasks and add permission
Using `environment` and `command` rather than `shell` avoids the
need for `no_log` and means that people can fix the problem
* refactor ecs_cluster test suite
move from runme.sh technique to virtualenv
use ec2_instance rather than ec2 module to
avoid need for boto