fix error on windows when creating root_dirs
fix error on windows when creating root_dirs

fix error on windows when creating root_dirs. On windows, user should be
Administrator.

paybyphone/zabbix-agent,apcera/chef-zabbix,Youscribe/zabbix,Feanor184/zabbix,TD-4242/cookbook-zabbix-server,Feanor184/zabbix,laradji/zabbix,Youscribe/zabbix,ftclausen/zabbix,bfraser/zabbix,TD-4242/cookbook-libzabbix,cmoad/zabbix,laradji/zabbix,TD-4242/zabbix-agent,ftclausen/zabbix,gueux/zabbix,tophercullen/zabbix,gester123/zabbix,cmoad/zabbix,tophercullen/zabbix,yakara-ltd/zabbix,TD-4242/zabbix-agent,TD-4242/zabbix-agent,gueux/zabbix,jollyrojer/zabbix,nilroy/zabbix,TD-4242/cookbook-zabbix-server,gueux/zabbix,paybyphone/zabbix-agent,nilroy/zabbix,yakara-ltd/zabbix,apcera/chef-zabbix,Feanor184/zabbix,laradji/zabbix,paybyphone/zabbix-agent,tophercullen/zabbix,jollyrojer/zabbix,yakara-ltd/zabbix,Youscribe/zabbix,apcera/chef-zabbix,jollyrojer/zabbix,bfraser/zabbix,cmoad/zabbix,nilroy/zabbix,bfraser/zabbix,TD-4242/cookbook-zabbix-server,TD-4242/cookbook-libzabbix,centraldesktop/zabbix