lbuild fetches zfs/spl source using git@github.com:zfsonlinux which requires a ssh keypair with git hub. If we change this to https://github.com/zfsonlinux then we will not need local keys for github as part of the builds.

The option to change the default by using SPLZFSGITREPO should be kept.

So change
git clone ${SPLZFSGITREPO:-"git@github.com:zfsonlinux"}/$pkg.git $pkg 2>&1
to
git clone ${SPLZFSGITREPO:-"https://github.com/zfsonlinux"}/$pkg.git $pkg 2>&1