Fix unsafe SSL connection on TrustedFilter

TrustedFilter was using httplib which doesn't check for CAs.
Here the change is using Requests and verifies local CAs by default (or another
one if provided)
This effort is related to CVE 2013-2255.

SecurityImpact

Closes-Bug: #1373993

Change-Id: I0b8e6319a4cc39876b1e396ef705f0fc5def1e44
Merge "Fix unsafe SSL connection on TrustedFilter"