"Fix" hack in ve.test.utils to prevent immediate surface setup

This used to work because loading i18n files took time. However,
we now don't register any message paths with the platform, so
platform initialization is now synchronous, which breaks the hack.

Instead, explicitly assign an unresolved deferred to the platform's
initialization promise, and resolve it after the mw.Target has been
constructed.

*barf*

Change-Id: I287cb86ce8c4c534fd723532f34463359a8ccc7c
Update VE core submodule to master (8e56dd5)

New changes:
36705e9 Replace setModulesPath with addMessagePath

Change-Id: I7b95d1f10bf2d131343613bc5e6bc334d3ad40d0
Merge ""Fix" hack in ve.test.utils to prevent immediate surface setup"
Merge "Update VE core submodule to master (8e56dd5)"