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The Host field of the HTTP request is set incorrectly when passing
the configured server.  The underlying HTTP library experts a hostname
to be passed.  When passing it a string of the form 'http://pdns.example.com

'
this gets converted into 'http:' (stripping everything from the first
slash onward).  However setting the Host field in the pdnsClientConfig
object is not needed because the underlying library will then parse the
hostname from the URL.

Fixes #661
Signed-off-by: Bartel Sielski <bartel.sielski@gmail.com>