delete old deprecated functions from scrapy.utils.python

[noviluni]

Hi there!

I deleted 4 deprecated functions from scrapy.utils.python (as mentioned here: #4356), the deprecation warnings were added in 07/2015 for three of them and in 03/2016 for the other.

As they are in the same file I decided to do just one PR, but if you prefer I can separate them in different PRs. There are two more deprecated functions in this file but as they were deprecated in 2019 I decided not to change them. Let me know what you think. 🙂

[codecov]

Codecov Report

Merging #4362 into master will increase coverage by 0.11%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4362      +/-   ##
==========================================
+ Coverage   84.01%   84.12%   +0.11%     
==========================================
  Files         165      165              
  Lines        9919     9897      -22     
  Branches     1473     1469       -4     
==========================================
- Hits         8333     8326       -7     
+ Misses       1332     1318      -14     
+ Partials      254      253       -1

Impacted Files	Coverage Δ
scrapy/utils/python.py	85.36% <ø> (+5.25%)	⬆️
scrapy/robotstxt.py	97.53% <0%> (ø)	⬆️
scrapy/core/downloader/__init__.py	90.9% <0%> (+1.51%)	⬆️

[kmike]

👍