connect/disconnect is now deprecated.

these hooks are replaced by api_connect/api_disconnect
which serve exactly the same purpose than before.
the old hooks are deprecated because they won't be called
from the gl driver anymore, but instead will be called
by our EGL wrapper. to maintain binary compatibility
it was necessary to introduce these new hooks.

Change-Id: I11756a5d99e3ea3d6fb61b943f82037932dfa56a