First run on a new client node fails checks which depend on plugins

[benh57]

I have a client check which depends on a plugin. To install it on the client, i pass it to the 'plugins' property of sensu, like:
class { 'sensu':
...
plugins => [
'puppet:///modules/profile/.../sensu/plugins/processes/check-procs.sh',
],
..
}

However this causes the first run of the check to fail, because the checks and sensu-client service are enabled in the puppet module before the plugins are installed:
sh: /etc/sensu/plugins/check-procs.sh: No such file or directory

To fix, the plugins should be installed before the service + checks/subscriptions are created.