* Add common TLS config routines
These routines can be used to load TLS configs based upon the
args in the Corefile.
* Add common routine for Corefile arg handling
Add the NewTLSConfigFromArgs routine so that you can just pass
in the Corefile args and get a tls.Config. This ensures the
parameters are handled consistently across middleware.
* Change to varargs style params
Change to use args ...string instead of []string. Add
documentation of what each call means.
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