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ref #4017

fixes #4017

ref #2862

we need uninstall .setup*

it is tmpfs and we know it will be removed on reboot. Infact, we want
it to be removed on reboot.

we no longer use RELEASES

- use apk update to test the download speed
- print the times
- use /proc/uptime instead of 'time'

ref #1073

- use alpine version from /etc/alpine-release
- dont ask for testing repo, but just add it commented
- give user option to edit file manually
- give user opptortunity to add several mirrors
- first time default is 'detect fastest', second default is 'done'
- only update apk index if anything changed

apk update -q will output error if any and be quiet otherwise.
we dont need extra logic to fish out error messages.

We only need the hostname after we found the mirror we want

saves a fork

Might be handy if we want count differently, strip comments etc in future

use get_hostname_from_url function to make it more readable

- allow override MIRRORS via env var
- don't error if MIRRORS.txt is missing
- other minor cleanups

Use case ... in instead of if ... elif ...

nslookup statement needed bind-tools version of nslookup, not busybox

Changelog:
- Now selects the fastest mirror (albeit somewhat crudely);
- Updates existing main and testing repos to use the fastest mirror;
- If the main repository isn't listed, it will be added;
- If the testing repository isn't listed, it will be added - commented out;
- Despite these changes, it does not clobber other repository entries;
- Will output errors and warnings from 'apk update';

Retrieve MIRRORS.txt and get mirror from there, automatically choose release if possible, and if not prompt for desired release

ref # 487