AETHER-3110 Make keyingtries configurable

Change-Id: Ib18b7590b461126dd7e6bcde3c87336163dc913b
diff --git a/defaults/main.yml b/defaults/main.yml
index 4f2458e..6ca42d9 100644
--- a/defaults/main.yml
+++ b/defaults/main.yml
@@ -35,6 +35,7 @@
 # Acceptable values are add, start, or route
 strongswan_conf_auto: "route"
 strongswan_conf_dpdaction: "clear"
+strongswan_conf_keyingtries: "3"
 
 # Whether rekeying of an IKE_SA should also reauthenticate the peer
 strongswan_conf_reauth: "no"