#1489477 Add M4 instance types to AWS where available

[buggtb]

https://bugs.launchpad.net/juju-core/+bug/1489477

Went through the available AWS regions and added M4 instance types and USD costs.

[mitechie]

@perrito666 can you please take a look at this and help @buggtb get this in for 2.0 please? Thanks!

[perrito666]

Thank you so much for this contribution, LGTM $$merge$$

[jujubot]

Status: merge request accepted. Url: http://juju-ci.vapour.ws:8080/job/github-merge-juju

[jujubot]

Build failed: Does not match ['fixes-1538241', 'fixes-1544796']
build url: http://juju-ci.vapour.ws:8080/job/github-merge-juju/6414

[perrito666]

This will be merged as soon as master is unlocked.

[wallyworld]

$$JFDI$$

[jujubot]

Status: merge request accepted. Url: http://juju-ci.vapour.ws:8080/job/github-merge-juju

[jujubot]

Build failed: Generating tarball failed
build url: http://juju-ci.vapour.ws:8080/job/github-merge-juju/6417

[wallyworld]

This work can't land because go fmt is sad. Please run go fmt and push

[wallyworld]

$$JFDI$$

[jujubot]

Status: merge request accepted. Url: http://juju-ci.vapour.ws:8080/job/github-merge-juju