Remove unwanted annotations from primary packages

[quantus]

primary_packages contains lower case package names where as ireq.name may contain upper case letters. This causes the primary packages to have the unwanted # via XXX annotations. In my case this issue was seen with packages SQLAlchemy and Flask.

Contributor checklist

• Provided the tests for the changes
• Added the changes to CHANGELOG.md
• Requested (or received) a review from another contributor

[quantus]

I forgot to tell in the PR how this problem can be reproduced.

Setup:

mkvirtualenv --python=$(which python2.7) test 
pip install Flask Flask-Debugtoolbar pip-tools
echo "Flask" > requirements.in
echo "Flask-Debugtoolbar" >> requirements.in

After the setup:

(test) ~/Documents/tmp pip-compile requirements.in 
#
# This file is autogenerated by pip-compile
# To update, run:
#
#    pip-compile --output-file requirements.txt requirements.in
#
blinker==1.4              # via flask-debugtoolbar
click==6.7                # via flask
flask-debugtoolbar==0.10.1
flask==0.12.2             # via flask-debugtoolbar
itsdangerous==0.24        # via flask, flask-debugtoolbar
jinja2==2.9.6             # via flask
markupsafe==1.0           # via jinja2
werkzeug==0.12.2          # via flask, flask-debugtoolbar

Version info:

(test) ~/Documents/tmp pip-compile --version
pip-compile, version 1.9.0
(test) ~/Documents/tmp pip --version
pip 9.0.1 from /Users/pekka/.virtualenvs/test/lib/python2.7/site-packages (python 2.7)

As we can see from the output, the flask dependency was listed to come from # via flask-debugtoolbar. As the flask dependency was our primary dependency, that comment should not be there.

With this information I feel this PR is ready to be reviewed.

[vphilippon]

Nice, thank you.
I requested a small change, other than that, LGTM

[vphilippon]

Good catch
While at it, as primary_packages was generated using key_from_req, we should use that here too for consistency.
key_from_req(ireq.req) in primary_packages

[quantus]

@vphilippon: I've made the change you requested.

[vphilippon]

Thanks for the contribution!