PHP upload_max_filesize setting

I noticed on a pull request open against the yesnault/docker-phabricator code base we forgot about upload_max_filesize.

$ shell devcentral php -i | grep upload_max_filesize
upload_max_filesize => 2M => 2M

Phabricator manual recommends to use 32M there.

PHP max_input_vars setting

The current default value should be increased to, according the Phabricator manual, "some astronomically high value".

$ shell devcentral php -i | grep max_input_vars
max_input_vars => 1000 => 1000

This setting has been introduced in PHP 5.3.9 to mitigate DoS "which use hash collisions".