Fix pip installation failures for Consul

[loicalbertin]

Fix Consul installation issue
Remove use of easy_install which is now deprecated
and not anymore installed per default on recent systems

Pull Request description

Description of the change

Python easy_install is deprecated in favor of pip and is not delivered by default anymore on most of distributions. Unfortunately we used easy_install to install pip itself. This change install pip using distributions package managers

What I did

Stop using easy_install at all (do not even try to install it). Determine if we are running Python 2 or 3 and install the corresponding package.

How to verify it

On GCP you can test to deploy a consul server with different OS
Note that Ubuntu 20.04 is not supported with Ansible 2.7.9 (opened ystia/yorc#648 to track it)

Description for the changelog

• Installation of Consul fails on recent Centos for GCP images (GH-131)

Applicable Issues

Fixes #131

[laurentganne]

Looks good!
The same change may be needed in the playbook installing Yorc at org/ystia/ansible/linux/ansible/playbooks/create.yml

[loicalbertin]

Looks good!
The same change may be needed in the playbook installing Yorc at org/ystia/ansible/linux/ansible/playbooks/create.yml

Ho yes I see.
This is even worst because in ansible we force the use of python2 libs....

This seems to be an overkill but we may finally have to consider a component to install pip... and some dependencies.

[laurentganne]

Looks good!
The same change may be needed in the playbook installing Yorc at org/ystia/ansible/linux/ansible/playbooks/create.yml

You mean in Yorc bootstrap?

Yes in bootstrap, and here in the forge as well at org/ystia/ansible/linux/ansible/playbooks/create.yml.
There are also the use of easy_install in the forge for docker container, at:
org/ystia/docker/containers/generic/playbooks/create.yaml

and also these ones that I'm not using personally:
org/ystia/samples/apache-log-generator/linux/ansible/apache-log-generator_install.yaml
org/ystia/ssl/ansible-ssl-certificates/playbooks/create.yml

[loicalbertin]

Looks good!
The same change may be needed in the playbook installing Yorc at org/ystia/ansible/linux/ansible/playbooks/create.yml

You mean in Yorc bootstrap?

Yes in bootstrap, and here in the forge as well at org/ystia/ansible/linux/ansible/playbooks/create.yml.
There are also the use of easy_install in the forge for docker container, at:
org/ystia/docker/containers/generic/playbooks/create.yaml

and also these ones that I'm not using personally:
org/ystia/samples/apache-log-generator/linux/ansible/apache-log-generator_install.yaml
org/ystia/ssl/ansible-ssl-certificates/playbooks/create.yml

Ok I will limit to components involved in Yorc bootstrap for now.
Then we may consider having a component for dealing with this in a single place.
Maybe we can finish & refactor #75

[loicalbertin]

@laurentganne changed Ansible component too.

[laurentganne]

Looks good! 👍