Revert "Use ssh for submodules, makes it easier to manage from"

Per IRC with Ori, let's not contaminate WMF deployment considerations
in the repo. We'll use url.<url>.insteadOf in /etc/gitconfig instead.

This reverts commit f2f23f12d92053ad9ea39c554ae2c1591d03bf08.

Change-Id: I4e14a6ac1e68f10642e802c0ad9d5adc672a223d
Merge "Revert "Use ssh for submodules, makes it easier to manage from""