[CORD-1811]
Create a separate Vagrant SSH config file, check if it's included in
~/.ssh/config, rather than overwriting.

Add clean-openstack target

Change-Id: Ifcaf78c40ccb77ad2231cb2013cfdf540ffba365
(cherry picked from commit 32295d5534f170180b1febbd1158167c53598273)
diff --git a/ansible.cfg b/ansible.cfg
index 073b1f5..0902052 100644
--- a/ansible.cfg
+++ b/ansible.cfg
@@ -5,5 +5,5 @@
 timeout=30
 
 [ssh_connection]
-ssh_args = -o ControlMaster=auto -o ControlPersist=15s
+ssh_args = -o ControlMaster=auto -o ControlPersist=15s -o ConnectionAttempts=20