Recompile requirements

This reintroduces packages which have been masked before (as they were pip
dependencies).

misc/requirements/requirements-flake8.txt

@@ -14,7 +14,10 @@ flake8-string-format==0.2.3
 flake8-tidy-imports==1.0.6
 flake8-tuple==0.2.13
 mccabe==0.6.1
+packaging==16.8
 pep8-naming==0.4.1
 pycodestyle==2.3.1
 pydocstyle==1.1.1  # rq.filter: < 2.0.0
 pyflakes==1.5.0
+pyparsing==2.2.0
+six==1.10.0

misc/requirements/requirements-pylint-master.txt

@@ -11,6 +11,7 @@ mccabe==0.6.1
 -e git+https://github.com/PyCQA/pylint.git#egg=pylint
 ./scripts/dev/pylint_checkers
 requests==2.17.3
+six==1.10.0
 uritemplate==3.0.0
 uritemplate.py==3.0.2
 urllib3==1.21.1

misc/requirements/requirements-pylint.txt

@@ -11,6 +11,7 @@ mccabe==0.6.1
 pylint==1.7.1
 ./scripts/dev/pylint_checkers
 requests==2.17.3
+six==1.10.0
 uritemplate==3.0.0
 uritemplate.py==3.0.2
 urllib3==1.21.1

misc/requirements/requirements-tests.txt

@@ -31,5 +31,6 @@ pytest-rerunfailures==2.1.0
 pytest-travis-fold==1.2.0
 pytest-xvfb==1.0.0
 PyVirtualDisplay==0.2.1
+six==1.10.0
 vulture==0.14
 Werkzeug==0.12.2