Use correct variable for host_access dependency

The keystone::db::mysql resource declares resources using
`$real_allowed_hosts` which is a copy of `$allowed_hosts` minus `$host`.
But then it declares dependencies using `$allowed_hosts` which includes
`$host` and will fail catalog compilation due to a missing dependency

This bug only affects users if the value of `$host` is included in the
array of `$allowed_hosts`

Change-Id: Ifdd8793bcf36178efd1a083ee35649d56dc3d768
Updated to match semver and release notes.

Before this update the Modulefile was not following semver in
relation to stable/havana, and the README files were not in sync.
This update introduces proper semver and consistency.

Keystone in fixtures tracks master. Fix modulefile to match
this dependency and be consistent with Horizon dependency

Change-Id: I622ef84b5c50abd1da96a75e9935265cd947ca6a
Merge "Updated to match semver and release notes."
Merge "Use correct variable for host_access dependency"