'extra_args' has been available since 1.0 of ansible.builtin and this
module already uses 'executable' which was added in 1.3 so this should
be perfectly safe to add.
The package naming for pip has changed in centos8. Previously the pip
package was called python-pip for python2 and python3-pip for python3.
In CentOS 8 the packages are now called python2-pip for python2 ad
python3-pip for python3.
On Amazon Linux, installing `python-pip` acutally installs the
`python26-pip` package, so anything running in Python 2.7 won't
find the dependencies installed with that `pip`.
This allows the package name to be customised, depending on the OS
and Python versions.
