Fix agent registration

HI.

1. I've tried to use agent:registration recipe and I have errors.
If I use "recipe:zabbix\\:\\:server" instead of "recipes:zabbix\\:\\:server"  zabbix_server not found.

2. After fix it I have error  Exception*: NoMethodError: zabbix_host[my.node.com] (zabbix::agent_registration line 75) had an error: NoMethodError: undefined method `values' for #<Array:0x000000035aad68>

I propose to fix it :)