When the building scripts involved in the containerization
processes are executed behind a proxy, the user must set the
proxy manually making modifications in the scripts or dockerfiles.
These changes allows to set it as an argument.
Story: 2004925
Task: 29305
Change-Id: I52e13e4832daf488d8ff29334686a20daa7d2826
Signed-off-by: Mario Alfredo Carrillo Arevalo <mario.alfredo.c.arevalo@intel.com>