Fix Ubuntu Erlang Install Issue

[devsibwarra]

Proposed Changes

The Ubuntu packager tries to satisfy dependencies when erlang-base is installed. Since this occurred before the other erlang-* packages are pinned, this causes incompatible versions to be installed. This PR updates the logic to manage all Debian packages at the same time.

While messing around in the provider code, I noticed the removal logic for non-debian platforms stuck inside the debian block.

Types of Changes

• Bug fix (non-breaking change which fixes Pinned Erlang fails to install from Bintray on Ubuntu #525 )
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation (correction or otherwise)
• Cosmetics (whitespace, appearance)

Checklist

• I have read the CONTRIBUTING.md document
• I have signed the CA (see https://cla.pivotal.io/sign/rabbitmq)
• All tests pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)
• Any dependent changes have been merged and published in related repositories

Further Comments