Upgrade to minimum supported Python 3.6

Getting the following error on a fresh vagrant up:

    default: Installing pip... (for Ansible installation)
The following SSH command responded with a non-zero exit status.
Vagrant assumes that this means the command failed!

curl https://bootstrap.pypa.io/get-pip.py | sudo python

Stdout from the command:

ERROR: This script does not work on Python 2.7 The minimum supported Python version is 3.6. Please use https://bootstrap.pypa.io/pip/2.7/get-pip.py instead.


Stderr from the command:

  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 1911k  100 1911k    0     0  3185k      0 --:--:-- --:--:-- --:--:-- 3185k

Seems I am able to fix by simply supplying pip3 in Vagrantfile and running vagrant up --provision.