Update ControlPersist to 60 min in kubespray

Default setting was 30 min and jobs start to fail randomly
if it takes longer. Theory was if it is more, there's possibility
of removing the files and reconnect. If it happens at a good time
the ssh connection is dropped.

Change-Id: If719f377dba9116dabf5e136235b41587146bdb7
1 file changed