osm_vector_maps was repeatedly failing to install, so use 'timeout: "{{ download_timeout }}"' with get_url (in 10 roles!) [& change IIAB's 'download_timeout: 200' to 100 sec]

[holta]

IIAB's OpenStreetMap installer (osm-vector-maps/tasks/install.yml) is very fragile when GitHub and/or your ISP (Internet) is overwhelmed.

As I discovered repeatedly yesterday, the problem is especially acute when trying to install osm-vector-maps as a result of this role downloading so many different files.

This PR fixes the problem, by avoiding Ansible's default timeout for get_url: of 10 seconds, and using 100 seconds instead.

This PR also establishes 'timeout: "{{ download_timeout }}"' essentially across the board, for almost all of repo iiab/iiab's ~50 uses of get_url, as this was missing from almost 10 roles.

The exception (where we do not want to use timeout: "{{ download_timeout }}") is:

iiab/roles/0-init/tasks/network.yml

Lines 22 to 31 in 2634fa2

	- name: 'Test for Internet access, using: {{ iiab_download_url }}/heart-beat.txt'
	get_url:
	url: "{{ iiab_download_url }}/heart-beat.txt"
	dest: /tmp/heart-beat.txt
	#timeout: "{{ download_timeout }}"
	# @jvonau recommends: 100sec is too much (keep 10sec default)
	ignore_errors: True
	#async: 10
	#poll: 2
	register: internet_access_test

Note that the Internet is comparatively more stable in major cities around the world in 2021, as compared to 5 years ago, so this PR also lowers download_timeout: 200 to download_timeout: 100 (seconds), to try to avoid pointlessly frustrating delays.

In future years we (might!) possibly want to further lower this IIAB setting (in default_vars.yml etc) from 100 seconds, down to 60 seconds or so?

Tangentially related:

• (A) "size" erroneous in map-catalog.json (B) NEW OSM dataset from Oct/Nov 2020 (C) Prep for future datasets incl Satellite Photos #3077
• PR www_base/tasks/php-stem.yml needs phpX.Y-sqlite3 (es-wikihow search was failing when osm-vector-maps was not installed) #3082

[holta]

This PR was tested over the past 2 hours with a LARGE-sized install on RasPiOS 11 on RPi 4.

All looks great.

This should help make IIAB installs substantially more reliable.