Strip scheme out of Host for cors_section
Strip scheme out of Host for cors_section

Value returned by `couch_httpd_vhost:host/1` might not contain scheme.
The cors section is named after vhost name (i.e. without scheme).
For example:

    [cors:partner.com]
    methods =
    headers =
    exposed_headers =
    origins = http://restricted.dev:8000

The origin in origins has to be given with scheme included.

COUCHDB-2945

fkaempfer/couchdb,fkaempfer/couchdb,fkaempfer/couchdb,fkaempfer/couchdb,fkaempfer/couchdb,fkaempfer/couchdb