[Delivers #47776529]Add support for internal url

**Story:**
https://www.pivotaltracker.com/story/show/47776529

Added an optional parameter (useInternalUrl) on all methods of CloudFilesProvider  (CDN excluded) for using public or internal (***ServiceNet***) url. 

***User's account will not be charged when making Cloud File requests (CDN excluded) within the same Data Center using the internal network host name. The Data Center internet network is called ServiceNet.***