"raw_input" doesn't work in Python3; replaced all instances with "input"

[dmyers2020]

When running the upgrade I got the following error:

Traceback (most recent call last):
File "mm_upgrade.py", line 222, in
step.run(context)
File "mm_upgrade.py", line 27, in run
wait_for_enter()
File "mm_upgrade.py", line 15, in wait_for_enter
raw_input("Press Enter to continue.")
NameError: name 'raw_input' is not defined

After replacing "raw_input" with "input" the script ran fine.