OpenStack works inside VM machines. 

- Provider network uses Vagrant's "physical" network in which virtual 
machine's communicate.

- nginx is provisioned by default into the controller node. 

- No dns by default given

- nginx restarted by handler

LimitNOFILE must be after [Service] without overwritting it.

The chrony task now sets up with the right network adress and prefix on 
the controller

Basic provision will authomatically download cirrOS and Debian, as well 
as build a new flavor to use with Debian

- Use of .json files to specify machine dependent parameters

- Allow using a yum proxy when needed via yum_proxy variable (if its not 
defined it will skip the step)

- Use ansible built-in variables to reach  environmental variables

- Changed the structure of nodes,.json file

- Generates configuration files either for an arbitrary number of 
virtual machines or from a hash of hosts using a .json file

[Vagrant&credentials.yml] Encripted credentials.yml file using vault. - Vault needs a password to decrypt variables file which is given via vault_secret (must be 600 on root).

- Vagrant will look for that file via ansible.vault_password_file 
variable set in the provision block.

- Vault needs a password to decrypt variables file which is given via 
vault_secret (must be 600 on root).

- Vagrant will look for that file via ansible.vault_password_file 
variable set in the provision block.

- Use _creates_ option to check for created files and directories.
- Everything goes to root's home (~ during provision)
- If the files/folder already exist, nothing happens (idempotency)

- admin Openstack credentials loaded as environment variables in each 
play.
- admin and demo credentials have been written into .bashrc (admin iff 
EUID==0).

Avoid downloading CirrOS image if it is already present.