Implement naming of isolated service bindings.

This allows clients to run multiple instances of the same
manifest service declaration.  It only works for isolated
services, to avoid too much abuse temptation.  This is part
of the "Chrome site isolation" work, to allow chrome to have
many more render processes running and help it manage them.

Bug: 111434506
Test: atest CtsAppTestCases:ServiceTest
Change-Id: I22e65758678a07075ed32ed6463082ddf846d3a4