`pip install Pootle[git]` doesn't work anymore

[RazZziel]

Steps to reproduce:

1. Run pip install --pre --process-dependency-links Pootle[git] as instructed in http://docs.translatehouse.org/projects/pootle/en/latest/features/integrate_with_vcs.html#install-pootle-fs-plugins-for-vcs

Results (Expected/Actual):

• Expected: Pootle[git] gets installed
• Actual: Pootle[git] fails to install:

Could not install packages due to an EnvironmentError: 404 Client Error: Not Found for url: https://pypi.org/simple/pootle-fs-git/

Complete log

root@babel:~# pip install --pre --process-dependency-links Pootle[git]
Requirement already satisfied: Pootle[git] in /usr/local/lib/python2.7/dist-packages (2.8.2)
Requirement already satisfied: scandir==1.5 in /usr/local/lib/python2.7/dist-packages (from Pootle[git]) (1.5)
Requirement already satisfied: Babel==2.5.1 in /usr/local/lib/python2.7/dist-packages (from Pootle[git]) (2.5.1)
Requirement already satisfied: pytz==2017.2 in /usr/local/lib/python2.7/dist-packages (from Pootle[git]) (2017.2)
Requirement already satisfied: bleach==2.0.0 in /usr/local/lib/python2.7/dist-packages (from Pootle[git]) (2.0.0)
Requirement already satisfied: rq==0.8.2 in /usr/local/lib/python2.7/dist-packages (from Pootle[git]) (0.8.2)
Requirement already satisfied: django-allauth==0.33.0 in /usr/local/lib/python2.7/dist-packages (from Pootle[git]) (0.33.0)
Requirement already satisfied: django-rq==0.9.6 in /usr/local/lib/python2.7/dist-packages (from Pootle[git]) (0.9.6)
Requirement already satisfied: stemming==1.0.1 in /usr/local/lib/python2.7/dist-packages (from Pootle[git]) (1.0.1)
Requirement already satisfied: diff-match-patch==20121119 in /usr/local/lib/python2.7/dist-packages (from Pootle[git]) (20121119)
Requirement already satisfied: cssmin==0.2.0 in /usr/local/lib/python2.7/dist-packages (from Pootle[git]) (0.2.0)
Requirement already satisfied: translate-toolkit==2.2.5 in /usr/local/lib/python2.7/dist-packages (from Pootle[git]) (2.2.5)
Requirement already satisfied: django-assets==0.12 in /usr/local/lib/python2.7/dist-packages (from Pootle[git]) (0.12)
Requirement already satisfied: python-levenshtein==0.12.0 in /usr/local/lib/python2.7/dist-packages (from Pootle[git]) (0.12.0)
Requirement already satisfied: python-dateutil==2.6.1 in /usr/local/lib/python2.7/dist-packages (from Pootle[git]) (2.6.1)
Requirement already satisfied: django-statici18n==1.4.0 in /usr/local/lib/python2.7/dist-packages (from Pootle[git]) (1.4.0)
Requirement already satisfied: django-contrib-comments!=1.8.0,==1.7.3 in /usr/local/lib/python2.7/dist-packages (from Pootle[git]) (1.7.3)
Requirement already satisfied: django-overextends==0.4.3 in /usr/local/lib/python2.7/dist-packages (from Pootle[git]) (0.4.3)
Requirement already satisfied: dirsync==2.2.2 in /usr/local/lib/python2.7/dist-packages (from Pootle[git]) (2.2.2)
Requirement already satisfied: lxml<=3.8.0,>=3.5 in /usr/local/lib/python2.7/dist-packages (from Pootle[git]) (3.8.0)
Requirement already satisfied: django-redis==4.8.0 in /usr/local/lib/python2.7/dist-packages (from Pootle[git]) (4.8.0)
Requirement already satisfied: Markdown==2.6.9 in /usr/local/lib/python2.7/dist-packages (from Pootle[git]) (2.6.9)
Requirement already satisfied: django-contact-form==1.4.2 in /usr/local/lib/python2.7/dist-packages (from Pootle[git]) (1.4.2)
Requirement already satisfied: pathlib==1.0.1 in /usr/local/lib/python2.7/dist-packages (from Pootle[git]) (1.0.1)
Requirement already satisfied: Django~=1.10.5 in /usr/local/lib/python2.7/dist-packages (from Pootle[git]) (1.10.8)
Requirement already satisfied: jsonfield==2.0.2 in /usr/local/lib/python2.7/dist-packages (from Pootle[git]) (2.0.2)
Requirement already satisfied: django-bulk-update==2.2.0 in /usr/local/lib/python2.7/dist-packages (from Pootle[git]) (2.2.0)
Requirement already satisfied: pycountry==17.5.14 in /usr/local/lib/python2.7/dist-packages (from Pootle[git]) (17.5.14)
Requirement already satisfied: django-sortedm2m==1.5.0 in /usr/local/lib/python2.7/dist-packages (from Pootle[git]) (1.5.0)
Collecting pootle-fs-git==0.0.1; extra == "git" (from Pootle[git])
Could not install packages due to an EnvironmentError: 404 Client Error: Not Found for url: https://pypi.org/simple/pootle-fs-git/

Environment (i.e. 'pootle --version', DB, OS, Browser):

root@babel:~# pip --version
pip 18.1 from /usr/lib/python2.7/dist-packages/pip (python 2.7)

root@babel:~# cat /etc/os-release 
PRETTY_NAME="Debian GNU/Linux 10 (buster)"
NAME="Debian GNU/Linux"
VERSION_ID="10"
VERSION="10 (buster)"
VERSION_CODENAME=buster
ID=debian
HOME_URL="https://www.debian.org/"
SUPPORT_URL="https://www.debian.org/support"
BUG_REPORT_URL="https://bugs.debian.org/"

[buhtz]

#6920