learning-gem5: This commit changes variable names in the tutorial

Changed files from part 1 and part 2 of the learning-gem5
tutorial to use variable names int_requestor,int_responder,
cpu_side_ports, and mem_side_ports instead of master and slave.

Change-Id: I06ba4a337d947d22c39b5de3ba6700d64bda02c4
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/47839
Reviewed-by: Hoa Nguyen <hoanguyen@ucdavis.edu>
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>
4 files changed