fix keystone install

Author: f0rki

keystone/install

@@ -1,5 +1,4 @@
 #!/bin/bash -ex
 
-ctf-tools-pip install -U keystone
-# seems to be broken?
-#ctf-tools-pip3 install -U keystone
+ctf-tools-pip install -U keystone-engine
+ctf-tools-pip3 install -U keystone-engine