Fix .gitmodules to use relative links
Fix .gitmodules to use relative links

This fixes issues with pulling bootplate-moonstone through
firewalls or from local mirrors.

Enyo-DCO-1.1-Signed-Off-By: Ben Combee (ben.combee@lge.com)

enyojs-samples/always-viewing-videoplayer-sample,Djspaceg/moonstone-directory-index