Revert "Pull in patched eventlet to fix Second Simultaneous errors"

This reverts commit 0011e19c15.

Eventlet version 0.15.1 has been released with the fix to the
"Second Simultaneous error"

Change-Id: I1e6e27f32f1b24e14a4ecb91f3433647fbb69a3e

elements/os-svc-install/bin/os-svc-install

@@ -41,12 +41,6 @@ function python_install() {
         pip install -U 'pbr>=0.5.21,<1.0'
 
         if [ -n "$reqs" ] ; then
-            # Wwe have patched eventlet to solve issues there.
-            # Carry it locally until we get it merged upstream.
-            if grep -qw "^eventlet" $reqs ; then
-                pip install /opt/stack/eventlet
-            fi
-
             pip install -r $reqs
             # FIXME: pip requires doesn't include MySQL-python
             pip install MySQL-python

elements/os-svc-install/source-repository-eventlet

@@ -1 +0,0 @@
-eventlet git /opt/stack/eventlet https://github.com/jan-g/eventlet.git wip