Wait for installd to finish starting before booting.

Fixes a race condition where the system server might
try to access /data/user/0 before it was created.  In so
doing, the system server could end up creating a directory
in that location with the wrong permissions and everything
would promptly crash.

Bug: 7151686
Change-Id: I349c12fd2b9685d2e7f6305e74f6bf7d5816b752