Bug 758823 - Don't create egg-info directories when populating virtua…

…lenv; r=ted

This patch basically bypasses setup.py for pure Python packages. Instead
of producing .egg-info directories in the source tree, it merely
installs .pth files pointing back to the source directory. As a result,
this is less junk in the source tree.

The .hgignore and .gitignore entries for egg-info directories have been
removed because there should no longer be egg-info directories any more.
People should clean up these orphaned directories manually. This can be
accomplished by running:

  $ hg status -u | grep .egg-info | xargs rm -rf
  $ git ls-files -o '*.egg-info*' | xargs rm -rf

.gitignore

@@ -45,6 +45,3 @@ parser/html/java/javaparser/
 .project
 .cproject
 .settings/
-
-# Python stuff installed at build-time
-*.egg-info/

.hgignore

@@ -45,6 +45,3 @@ _OPT\.OBJ/
 \.project$
 \.cproject$
 \.settings/
-
-# Python stuff installed at build-time
-\.egg-info/

build/virtualenv/packages.txt

@@ -1,12 +1,12 @@
-setup.py:python/simplejson-2.1.1:develop
-setup.py:testing/mozbase/manifestdestiny:develop
-setup.py:testing/mozbase/mozinfo:develop
-setup.py:testing/mozbase/mozinstall:develop
-setup.py:testing/mozbase/mozlog:develop
-setup.py:testing/mozbase/mozprocess:develop
-setup.py:testing/mozbase/mozprofile:develop
-setup.py:testing/mozbase/mozrunner:develop
-setup.py:python/blessings:develop
-setup.py:python/mozbuild:develop
+simplejson.pth:python/simplejson-2.1.1
+manifestdestiny.pth:testing/mozbase/manifestdestiny
+mozinfo.pth:testing/mozbase/mozinfo
+mozinstall.pth:testing/mozbase/mozinstall
+mozlog.pth:testing/mozbase/mozlog
+mozprocess.pth:testing/mozbase/mozprocess
+mozprofile.pth:testing/mozbase/mozprofile
+mozrunner.pth:testing/mozbase/mozrunner
+blessings.pth:python/blessings
+mozbuild.pth:python/mozbuild
 mozilla.pth:build
 mozilla.pth:config