Allow getopt / getattr to bluetooth unix_stream_socket.

Resolve denials such as:

avc:  denied  { getattr } for  pid=16226 comm="Thread-2096" path="socket:[414657]" dev="sockfs" ino=414657 scontext=u:r:untrusted_app:s0 tcontext=u:r:bluetooth:s0 tclass=unix_stream_socket

avc:  denied  { getopt } for  pid=5890 comm="FinalizerDaemon" scontext=u:r:untrusted_app:s0 tcontext=u:r:bluetooth:s0 tclass=unix_stream_socket

(cherry picked from commit 495e9d12)

Change-Id: Ie38979416b36b4452375d58baff46f14b78f1bad
Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>