add more flexible source/content options

this makes it so you can do one of a few things:

 1. pass no $content, or $source and the default will be taken (search path checking first
    for site_x509/{CAs,keys,certs}/$::fqdn/${name}.crt, secondly for
    site_x509/{CAs,keys,certs}/${name}.crt

 2. pass $content, allowing you to specify templates etc.

 3. pass $source, allowing you to specify any source you wish

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