Add AMI support

In order to install consul for AMI it is important to:

1. To not start it on provision phase otherwise, it will fail to start on a new instance
2. To get a valid IP address and hostname for the new instance

Support producer tags

Merge pull request #41 from hellofresh/feature/producer-tags

Support producer tags

Support producer tags

v0.7.1

Support producer tags

v0.8.1: Fix/override env (#40)

* Added option to override env

* removed env_name from backend and frontends

* fix tests

v0.8.0: Use consul tags for localport. (#39)

* Use consul tags for localport.

Frontends are no longer created for failing services.
This means HAProxy will not open localports for failing services.

* Added default values of local_ports.

Reverted frontends not being created.

v0.7.0: Add environment fallback.

HAproxy backends by default use the 'key' for the service definition. If no backend is found, <service_name>-<env_name> is used.

v0.6.0: Added wrr support with weights. (#33)

* Added wrr support with weights.

Added tests for functionality.

Signed-off-by: Ali Rizwan <ari@hellofresh.com>

* Fix tests for ubuntu14.04

Signed-off-by: Ali Rizwan <ari@hellofresh.com>

v0.5.3: Merge pull request #32 from hellofresh/fix/variablename

Fix variable name

v0.5.2

fix path and make ubuntu 14.04 compatible

Fix version symlink

Link approach (#30)

* Link approach

* Fix consul-template