[wkrd] Fix zc.recipe.egg name in test index

With recent setuptools, calling `python setup.py sdist` to create an
archive for zc.recipe.egg creates a zc_recipe_egg-xyz.zip instead of
a zc.recipe.egg-xyz.zip. This is called during test setup to prepare
a local package index, as the tests prevent access to PyPI. The name
change leads the index to find an entry for zc-recipe-egg instead of
zc.recipe.egg (as normalization replaces _ with -), which causes the
tests to fail to find a distribution for zc.recipe.egg.

src/zc/buildout/tests/test_all.py

@@ -2831,12 +2831,12 @@ def wont_downgrade_due_to_prefer_final():
     ... [buildout]
     ... parts =
     ... [versions]
-    ... zc.buildout = >.1
+    ... zc.buildout = >0.1
     ... ''')
     >>> [str(l.split('= >', 1)[1].strip())
     ...        for l in system(buildout+' -vv').split('\n')
     ...        if l.startswith('zc.buildout =')]
-    ['.1']
+    ['0.1']
 
     >>> write('buildout.cfg',
     ... '''
@@ -3796,10 +3796,20 @@ def buildout_txt_setup(test):
     dist = pkg_resources.working_set.find(
         pkg_resources.Requirement.parse('zc.recipe.egg'))
     mkdir(eggs, 'zc.recipe.egg')
+    dest = os.path.join(eggs, 'zc.recipe.egg')
     zc.buildout.testing.sdist(
         os.path.dirname(dist.location),
-        os.path.join(eggs, 'zc.recipe.egg'),
+        dest,
         )
+    # Workaround recent setuptools generating zc_recipe_egg-xyz.zip
+    # rather than zc.recipe.egg-xyz.zip, and resulting in the index
+    # containing an entry for zc-recipe-egg instead of zc.recipe.egg
+    # (after normalisation). Even though running python setup.py sdist
+    # directly __is__ deprecated.
+    zipfile, = os.listdir(dest)
+    correct = zipfile.replace('zc_recipe_egg', 'zc.recipe.egg')
+    if correct != zipfile:
+        shutil.move(os.path.join(dest, zipfile), os.path.join(dest, correct))
 
 egg_parse = re.compile(r'([0-9a-zA-Z_.]+)-([0-9a-zA-Z_.+]+)-py(\d[.]\d+)$'
                        ).match