Merge branch 'awstats_default_3549' into 'stable-3.1'

Make AWstats default

Webalizer is pretty old and the latest release dates back to 2013.  
The generated statistics are even not really accurate, as mentioned here:  https://en.wikipedia.org/wiki/Webalizer#Criticism  

In conclusion I would appreciate it if the default value could be changed to AWstats.  
This merge request does address #3549

See merge request !577

install/sql/incremental/upd_dev_collection.sql

 ALTER TABLE `web_domain` CHANGE `folder_directive_snippets` `folder_directive_snippets` TEXT CHARACTER SET utf8 COLLATE utf8_general_ci NULL;
 ALTER TABLE `web_domain` ADD `log_retention` INT NOT NULL DEFAULT '30' AFTER `https_port`;
+ALTER TABLE `web_domain` CHANGE `stats_type` `stats_type` VARCHAR(255) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT 'awstats';

install/sql/ispconfig3.sql

@@ -1955,7 +1955,7 @@ CREATE TABLE `web_domain` (
   `ssl_key` mediumtext NULL,
   `ssl_action` varchar(16) NULL,
   `stats_password` varchar(255) default NULL,
-  `stats_type` varchar(255) default 'webalizer',
+  `stats_type` varchar(255) default 'awstats',
   `allow_override` varchar(255) NOT NULL default 'All',
   `apache_directives` mediumtext,
   `nginx_directives` mediumtext,

interface/web/sites/form/web_vhost_domain.tform.php

@@ -609,7 +609,7 @@ $form["tabs"]['stats'] = array (
 		'stats_type' => array (
 			'datatype' => 'VARCHAR',
 			'formtype' => 'SELECT',
-			'default' => 'webalizer',
+			'default' => 'awstats',
 			'value'  => array('webalizer' => 'Webalizer', 'awstats' => 'AWStats', '' => 'None')
 		),
 		//#################################