Support for Telefónica Network API extension + minor bugfixes and enhancements

Hi!

I've added two new modules ("tef" and "network") to support Telefonica Network API extension (documented at https://api-eu-lon-1.instantservers.telefonica.com/docs/networkapi_docs.html or any other endpoint) on top of SDC 6.5.

I've moved the TELEFONICA_LOCATIONS from "datacenter" to "tef", and added the ACENS_LOCATIONS, which is a Telefónica company selling the service at Spain (so endpoints are different).

Also, some bugfixes and enhancements (for example, properly parsing "Content-Type: application/json; charset=xxx").

Regards. --AJ