restore greenlet req

greenlet 1.0 is now released, so as openstack builds are up again and the upstream pip bug
is fixed, let's now try to restore the requirements we had as we'd
rather not have users confused about why asyncio doesn't work without
additional packages.

Change-Id: I33fe4eb754f3043f28f37be036df7a602917bac2

diff --git a/setup.cfg b/setup.cfg
index 792a35d6e2f5fcae2690ae6dd7ff7660825ffb8c..cdd9894d64fad34fa882d9269862492f9156be7b 100644 (file)
--- a/setup.cfg
+++ b/setup.cfg
@@ -40,6 +40,7 @@ package_dir =
 
 install_requires =
     importlib-metadata;python_version<"3.8"
+    greenlet != 0.4.17;python_version>="3"
 
 [options.extras_require]
 asyncio =