Move servo-android-glue submodule to mozilla-servo.

For some reason the webconvforge organization is the cause of many API
failures. They seem to be sporadic but no one has any idea why it
happens.
auto merge of #1543 : metajack/servo/local-submodules, r=jdm

For some reason the webconvforge organization is the cause of many API
failures. They seem to be sporadic but no one has any idea why it
happens.