Exec[zabbix_server_create.sql] does not work because is might come after Package[zabbix-server-mysql

[stefanandres]

Affected Puppet, Ruby, OS and module versions/distributions

• Puppet: 5.5.1
• Distribution: ubuntu-16.04
• Module version: 6.3.1

Puppet fails with

       Notice: /Stage[main]/Zabbix::Database::Mysql/Exec[zabbix_server_create.sql]/returns: /bin/sh: 1: cd: can't cd to /usr/share/doc/zabbix-*-mysql*
       Error: 'cd /usr/share/doc/zabbix-*-mysql* && if [ -f create.sql.gz ]; then gunzip -f create.sql.gz ; fi && mysql -h '127.0.0.1' -u 'zabbix_server' -p'test1234' -D 'zabbix_server' < create.sql && touch /etc/zabbix/.schema.done' returned 2 instead of one of [0]
       Error: /Stage[main]/Zabbix::Database::Mysql/Exec[zabbix_server_create.sql]/returns: change from 'notrun' to ['0'] failed: 'cd /usr/share/doc/zabbix-*-mysql* && if [ -f create.sql.gz ]; then gunzip -f create.sql.gz ; fi && mysql -h '127.0.0.1' -u 'zabbix_server' -p'test1234' -D 'zabbix_server' < create.sql && touch /etc/zabbix/.schema.done' returned 2 instead of one of [0]

because the package might be installed afterwards:

       Notice: /Stage[main]/Zabbix::Server/Package[zabbix-server-mysql]/ensure: created

https://github.com/voxpupuli/puppet-zabbix/blob/master/manifests/database/mysql.pp#L78 is missing requires for this package.

[stefanandres]

Fixed with #508