Improve and document jk_init for PHP 7.1

README.md

+When updating PHP version at a later stage, there are extra steps that need to be taken:
+
+- Update `/etc/jailkit/jk_init.ini`
+- Force updating all Jails: `jk_init --force -j /jails/[NAME]/ php`
+- Manually update `/jails/[NAME]/etc/alternatives/php`

templates/jk_init.ini

@@ -170,7 +170,7 @@ executables = /usr/local/bin/php
 directories = /usr/lib/php5, /usr/share/php, /usr/share/php5, /etc/php5, /usr/share/zoneinfo, /usr/local/lib/php/extensions
 {% elif php_version_main|default('7') == '7' %}
 executables = /usr/bin/php
-directories = /usr/lib/php, /usr/share/php, /usr/share/php{{php_version|default("7.0")}}-*, /etc/php, /usr/share/zoneinfo
+directories = /usr/lib/php, /usr/share/php, /usr/share/php{{php_version|default("7.0")}}-*, /etc/php, /usr/share/zoneinfo, /usr/lib/x86_64-linux-gnu/libxml*
 {% else %}
 executables = /usr/bin/php5
 directories = /usr/lib/php5, /usr/share/php, /usr/share/php5, /etc/php5, /usr/share/zoneinfo