[CORD-1608]
Fix DNS and ansible timeout issues when building docker images

Change-Id: I549387d458c280ac769e9c3a06a5e035457c0815
diff --git a/ansible.cfg b/ansible.cfg
index 1b10379..073b1f5 100644
--- a/ansible.cfg
+++ b/ansible.cfg
@@ -5,5 +5,5 @@
 timeout=30
 
 [ssh_connection]
-ssh_args = -o ControlMaster=auto -o ControlPersist=3s
+ssh_args = -o ControlMaster=auto -o ControlPersist=15s