Switch git modules over to ssh protocol.  Cutter is having
problems checking out via https.  In particular, it says:

fatal: unable to access 'https://github.com/rrnewton/HSBencher.git/': SSL certificate problem: unable to get local issuer certificate
Clone of 'https://github.com/rrnewton/HSBencher.git' into submodule path 'HSBencher' failed