move flake8 color option from config file to command line

Bug: T117570
Change-Id: Ie0a6dfff82ad99cb05db0c4dab40500d81a2405b

tox.ini

@@ -30,9 +30,9 @@ usedevelop = True
 commands =
     python --version
     flake8: flake8 --version
-    flake8-py36: flake8 --doctests {posargs} {[params]exclude}
-    flake8-py38: flake8 --doctests {posargs}
-    flake8-py39: flake8 --doctests {posargs}
+    flake8-py36: flake8 --color always --doctests {posargs} {[params]exclude}
+    flake8-py38: flake8 --color always --doctests {posargs}
+    flake8-py39: flake8 --color always --doctests {posargs}
 
     hacking: flake8 --version
     hacking: flake8 --format=default {posargs}
@@ -134,10 +134,8 @@ deps =
 ignore = B007,D105,D211,D401,D413,D412,DAR003,DAR101,DAR102,DAR201,DAR202,DAR301,DAR401,DAR402,DAR501,H101,H238,H301,H306,H404,H405,H903,P101,P102,P103,P205,W503
 enable-extensions = H203,H204,H205,N818
 
-color = always
 count = True
 exclude = .tox,.git,./*.egg,build,./scripts/i18n/*
-# format = %(blue)s%(path)s%(reset)s: %(bold)sline %(row)d:%(reset)s%(col)d: %(bold)s%(red)s%(code)s%(reset)s %(text)s
 max-complexity = 50
 
 # The following are to be fixed