requirements.txt: rename to py26reqs.txt and remove it from deps where possible.

When people see requirements.txt they tend to `pip install -r`
straight way
(c.f. https://github.com/letsencrypt/letsencrypt/issues/1252). It's
only necessary for Python2.6.

Dockerfile

@@ -48,7 +48,7 @@ COPY letsencrypt-apache /opt/letsencrypt/src/letsencrypt-apache/
 COPY letsencrypt-nginx /opt/letsencrypt/src/letsencrypt-nginx/
 
 
-# requirements.txt not installed!
+# py26reqs.txt not installed!
 RUN virtualenv --no-site-packages -p python2 /opt/letsencrypt/venv && \
     /opt/letsencrypt/venv/bin/pip install \
     -e /opt/letsencrypt/src/acme \

Dockerfile-dev

@@ -32,7 +32,8 @@ RUN /opt/letsencrypt/src/ubuntu.sh && \
 # the above is not likely to change, so by putting it further up the
 # Dockerfile we make sure we cache as much as possible
 
-COPY setup.py README.rst CHANGES.rst MANIFEST.in requirements.txt DISCLAIMER linter_plugin.py tox.cover.sh tox.ini pep8.travis.sh .pep8 .pylintrc /opt/letsencrypt/src/
+# py26reqs.txt not installed!
+COPY setup.py README.rst CHANGES.rst MANIFEST.in DISCLAIMER linter_plugin.py tox.cover.sh tox.ini pep8.travis.sh .pep8 .pylintrc /opt/letsencrypt/src/
 
 # all above files are necessary for setup.py, however, package source
 # code directory has to be copied separately to a subdirectory...
@@ -52,7 +53,6 @@ COPY tests /opt/letsencrypt/src/tests/
 
 RUN virtualenv --no-site-packages -p python2 /opt/letsencrypt/venv && \
     /opt/letsencrypt/venv/bin/pip install \
-    -r /opt/letsencrypt/src/requirements.txt \
     -e /opt/letsencrypt/src/acme \
     -e /opt/letsencrypt/src \
     -e /opt/letsencrypt/src/letsencrypt-apache \

MANIFEST.in

@@ -1,4 +1,4 @@
-include requirements.txt
+include py26reqs.txt
 include README.rst
 include CHANGES.rst
 include CONTRIBUTING.md

bootstrap/README

@@ -2,6 +2,6 @@ This directory contains scripts that install necessary OS-specific
 prerequisite dependencies (see docs/using.rst).
 
 General dependencies:
-- git-core: requirements.txt git+https://*
+- git-core: py26reqs.txt git+https://*
 - ca-certificates: communication with demo ACMO server at
-  https://www.letsencrypt-demo.org, requirements.txt git+https://*
+  https://www.letsencrypt-demo.org, py26reqs.txt git+https://*

bootstrap/dev/venv.sh

@@ -4,7 +4,7 @@
 export VENV_ARGS="--python python2"
 
 ./bootstrap/dev/_venv_common.sh \
-  -r requirements.txt \
+  -r py26reqs.txt \
   -e acme[testing] \
   -e .[dev,docs,testing] \
   -e letsencrypt-apache \

tox.ini

@@ -17,7 +17,7 @@ envlist = py26,py27,py33,py34,cover,lint
 commands =
     pip install -e acme[testing]
     nosetests -v acme
-    pip install -r requirements.txt -e .[testing]
+    pip install -r py26reqs.txt -e .[testing]
     nosetests -v letsencrypt
     pip install -e letsencrypt-apache
     nosetests -v letsencrypt_apache
@@ -44,7 +44,7 @@ commands =
 [testenv:cover]
 basepython = python2.7
 commands =
-    pip install -r requirements.txt -e acme -e .[testing] -e letsencrypt-apache -e letsencrypt-nginx -e letshelp-letsencrypt
+    pip install -e acme -e .[testing] -e letsencrypt-apache -e letsencrypt-nginx -e letshelp-letsencrypt
     ./tox.cover.sh
 
 [testenv:lint]
@@ -54,7 +54,7 @@ basepython = python2.7
 # duplicate code checking; if one of the commands fails, others will
 # continue, but tox return code will reflect previous error
 commands =
-    pip install -r requirements.txt -e acme -e .[dev] -e letsencrypt-apache -e letsencrypt-nginx -e letsencrypt-compatibility-test -e letshelp-letsencrypt
+    pip install -e acme -e .[dev] -e letsencrypt-apache -e letsencrypt-nginx -e letsencrypt-compatibility-test -e letshelp-letsencrypt
     ./pep8.travis.sh
     pylint --rcfile=.pylintrc letsencrypt
     pylint --rcfile=.pylintrc acme/acme