Create 110 Host Certificate Expiration Check

This plugin will check for certificate expiration on the vSphere hosts so that they can be renewed/replaced. Based heavily on Alan Renouf blog post - http://blogs.vmware.com/PowerCLI/2012/05/automating-ssl-checks-for-vcenter-and-host-certificates.html.
Merge pull request #155 from kdmhorn/patch-1

Create 110 Host Certificate Expiration Check