module errors on posix systems without unzip

[lesinigo]

On a fresh linux installation without unzip, trying to use the module as described errors when trying to unpack consul:

Error: Execution of 'unzip -o /opt/consul/archives/consul-1.0.2.zip' returned 1: Error: Could not execute posix command: No such file or directory - unzip
Error: /Stage[main]/Consul::Install/Archive[/opt/consul/archives/consul-1.0.2.zip]/ensure: change from 'absent' to 'present' failed: Execution of 'unzip -o /opt/consul/archives/consul-1.0.2.zip' returned 1: Error: Could not execute posix command: No such file or directory - unzip

This is documented in the puppet/archive module: https://forge.puppet.com/puppet/archive/2.0.0/readme#setup

Please consider installing unzip on posix system, e.g. with

ensure_packages(['unzip'])

[solarkennedy]

Related to #356.

See also #187 and #185.