It seems that the new phpcs3 checker is now controlling those
line comments that previously were ignored.

This commit just looks for all the cases and bulk-add
them when needed. The bash script (mac) used to add all them is:

while read -r line; do
    arr=(${line//:/ })
    if [[ -n ${arr[0]} ]] && [[ -n ${arr[1]} ]]; then
        echo "  file ${arr[0]}, line ${arr[1]}"
        sed -i "${arr[1]}s/\$/\./" ${arr[0]}
    fi
done < <(find . -name version.php | xargs ag --nomultiline '>(version|requires) *=.*//.*[^;\.]$')

Also adds xmlrpc-beta from PECL (PHP8 moved the extension there)
and setups max_input_vars=5000 as initial value (see MDL-71390).

Note that this also includes a tiny modification when configuring
redis sessions, because there was some outdated code from old issue,
now fixed (MDL-60978), so that info has been removed.

Without this, people can craft URLs that other users might use not realising
what they do - and as a XSS vulnerability, it could do any number of things the
clicking-user has access to do on the site.

Change-Id: I82adc71e8706d8929011b4b24523d5b62b8ccea1

passing null to getdate() has different results in PHP7 and PHP8