Flexible configuration syntax

[benwebber]

Changes:

• Replaces role variable interface with a flexible, map-based interface. Refer to the README for how we parse role variables.
• Eliminates individual templates in favour of single haproxy.cfg template.
• Adds support for mailers and peers sections.

This changeset will significantly reduce maintenance work and user frustration, since users will not need to hack the role or submit pull requests to add new options.

This is a breaking change and will require a major release.

Resolves: #54, #56, #77, #87 Obsoletes: #105, #106

[ktibi]

Hi, News about this PR ?

[r-daneel]

This is a heavy rewrite that looks quiet interesting. Will have a look in the coming days (time is scarce).

[k3nny0ne]

Any chance to merge it?

[benwebber]

@k3nny0ne Sorry for keeping you waiting. I missed your review. I'll address your feedback today.