Fixing boolean expressions syntax when installing templates/license

…est elastic#261)

[MPC-3028] improvements to network quality control script

* a script to simulate UDP network losses

* if/while code style

* feedback from Can

* mention default value for loss level

* remove default identity

* limit udp ports

* improvements suggested by Serge

* merge conflict resolved

Add Page and Block data abstractions to support compute.

A page is a column-oriented data abstraction that allows data to be
passed between operators in batches. A page is further composed of a
number of blocks. A Block is a columnar data representation that has a
position (row) count, and various data retrieval methods for accessing
the underlying data that is stored at a given position. Pages and Blocks
are immutable and can be passed between threads.

The data abstractions are added to the org.elasticsearch.compute.data
package of server, since they are fundamental to how data moves through
the compute engine.

Ansible 2.9.1 is the first version that is compatible with macOS and
Python >=3.8.0, so currently running Ansible via `make configure` fails
on macOS.

Unfortunately, so far, we've relied on installing requirements defined
in `setup.py` by directly invoking `python3 setup.py ...` which uses
`easy_install` to install the dependencies[1]. Apart from being a big
anti-pattern, Ansible >= 2.9 fails to install with
easy_install regardless of OS.

Install Ansible 2.9.6 (matching the version in esbench) via pip and
clean up Python version deps in setup.py and left-over Ansible
configuration options.

[1] http://cerfacs.fr/coop/python3_doc/pip_install/