Fix removal of keys on failed initialization.

The initialize key was checked against the value
of the node name before removal, but it was changed
recently to contain either an empty string, or cluster
sysid. To fix this, the check for the previous value
was simply removed: we can guarantee that the code path
that removes the key is the one that created it.

patroni/etcd.py

@@ -249,7 +249,7 @@ class Etcd(AbstractDCS):
 
     @catch_etcd_errors
     def cancel_initialization(self):
-        return self.retry(self.client.delete, self.initialize_path, prevValue=self._name)
+        return self.retry(self.client.delete, self.initialize_path)
 
     def watch(self, timeout):
         cluster = self.cluster

patroni/zookeeper.py

@@ -271,7 +271,7 @@ class ZooKeeper(AbstractDCS):
 
     def _cancel_initialization(self):
         node = self.get_node(self.initialize_path)
-        if node and node[0] == self._name:
+        if node:
             self.client.delete(self.initialize_path, version=node[1].version)
 
     def cancel_initialization(self):