ansible: Set conn. retries to 4, for tasks with large num. of hosts.

Signed-off-by: James Antill <james@and.org>

roles/ansible-server/templates/ansible.cfg.j2

@@ -862,6 +862,9 @@ enable_plugins=ini, constructed
 
 # (integer) Number of attempts to connect.
 ;retries=0
+#  Sometimes the nightly cron runs for updates/uptimes skip a host, assume
+# it's mostly due to weird connection/network issues so retry a bit.
+retries=4
 
 # (string) This defines the location of the scp binary. It defaults to C(scp) which will use the first binary available in $PATH.
 ;scp_executable=scp