Add HTTP proxy authentication, via the HTTP_PROXY_AUTH environment variable.
Add HTTP proxy authentication, via the HTTP_PROXY_AUTH environment
variable.

Tested by:	Emil Mikulic
X-MFC-After:	6.0-RELEASE

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase