Add a config module to hold configuration information

This is so that this information can be shared across modules without
ceremony.
Drop unused import
Reuse "common" functions
Reduce indentation
Reduce verbosity
Simplify role/policy translation

The translation "framework" was making it look more complex than it
needs to be.

By bypassing the framework, for now, we also remove validation from the
translation step. Separate validation is already in place.
Move IAM connection handling to own module
Stop merging role definition to Actor

This is done in anticipation to splitting out role handling to its own
independent module.
Split role creation into module
Check that load balancers exist before creating ASG

If an auto-scaling group is configured with ELB health-checks, but the
ELB does not exist, this will throw AWS AutoScaling into a loop of
creating and destroying instances, as no error is reported.

This check here will prevent this from happening, whether intentionally
or by mistake.
Notify user that ASG / LC already exist

hc2000 does not attempt to update existing auto-scaling groups or launch
configurations, silently proceeding as if it had created them.

Adding some information to the output as a first step. Going forward
this could become an error requiring explicit action to circumvent or
ASG and LC could be automatically updated to match the provided
definition as is already done when creating IAM roles.