Add missing ordering relationship between Exec['download'] and Package['al-agent']

[theosotr]

This commit fixes non-determinism between the following resources:

• Exec['download']
• Package['al-agent']

Package['al-agent'] requires Exec['download']

[theosotr]

Specifically, the application of the catalog might fail with the following error:

Error: Execution of '/usr/bin/dpkg --force-confold -i /tmp/al-agent' returned 2: dpkg: error: cannot access archive '/tmp/al-agent': No such file or directory
Error: /Stage[main]/Al_agents::Install/Package[al-agent]/ensure: change from purged to present failed: Execution of '/usr/bin/dpkg --force-confold -i /tmp/al-agent' returned 2: dpkg: error: cannot access archive '/tmp/al-agent': No such file or directory