Changing from dynamic to ondemand lowers the number of idle PHP processes from the default of 3 to 1. PHP automatically scales up the number of processes when required, but kills them after 10 seconds (default). I've seen PHP's memory consumption drop significantly. This should be very helpful for low-end VPS servers. Tested for a couple of months on a VPS with 1 GB and 1 CPU with 5 users. No noticeable negative loading times, but about 15% less RAM usage.
Based on this article: https://ma.ttias.be/a-better-way-to-run-php-fpm/
* Install PHP7 via a PPA, enable unattended upgrades for the PPA, and switch all of our PHP configuration to the PHP7 install.
* Keep installing PHP5 for ownCloud/Nextcloud packages because we need it to possibly run transitional updates to ownCloud/Nextcloud versions less than 12. But replace PHP5 packages with PHP7 packages elsewhere.
* Update to Nextcloud 12 which requires PHP7, with a transitional upgrade to Nextcloud 11.0.3.
* Disable TLS cert validation by Roundcube when connecting to localhost IMAP and SMTP. Validation became the default in PHP7 but we don't necessarily have a (non-self-)signed certificate and it definitely isn't valid for the IP address 127.0.0.1.
Merges #1140
Since it says "RCMCardDAV requires at least PHP 5.6.18. Older versions might work", let's hope for the best.
Also hiding its preferences panel in settings since if it doesn't work, we don't want folks using it for anything but connecting to ownCloud contacts.
* Move variable assignment up and do not use call arguments directly
* Upgrade ownCloud to latest patch release 9.1.4
also move owncloud hash to its own variable
pip<6.1 + setuptools>=34 have a problem with packages that
try to update setuptools during installation, like cryptography.
See https://github.com/pypa/pip/issues/4253. The Ubuntu 14.04
package versions are pip 1.5.4 and setuptools 3.3. When we
install cryptography under those versions, it tries to update
setuptools to version 34, which became available about 10 days
ago, and then pip gets permanently broken with errors like
"ImportError: No module named 'packaging'".
The easiest work-around on systems that aren't already broken is
to upgrade pip and setuptools individually before we install any
package that tries to update setuptools.
Also try to detect a broken system and forcibly remove setuptools
first before trying to install/upgrade pip.
fixes#1080, fixes#1081, fixes#1086
see #1083
see https://discourse.mailinabox.email/t/error-with-pip-and-python/1880
see https://discourse.mailinabox.email/t/error-installing-mib/1875
