bluetooth: allow sending bugreports via bluetooth

Bluetooth can receive bugreport data for beaming to another device.
This comes across as an open file descriptor. Allow bluetooth access
to bugreports.

Addresses the following denial:

  avc: denied { read } for path="/data/data/com.android.shell/files/bugreports/bugreport-2014-12-19-15-35-32.txt" dev="dm-0" ino=662738 scontext=u:r:bluetooth:s0 tcontext=u:object_r:shell_data_file:s0 tclass=file permissive=0

Change-Id: I7be2ce2e0e48323c1e8f932be17b434b89daf085

bluetooth.te

@@ -53,6 +53,11 @@ allow bluetooth bluetooth_service:service_manager find;
 allow bluetooth radio_service:service_manager find;
 allow bluetooth system_server_service:service_manager find;
 
+# already open bugreport file descriptors may be shared with
+# the bluetooth process, from a file in
+# /data/data/com.android.shell/files/bugreports/bugreport-*.
+allow bluetooth shell_data_file:file read;
+
 ###
 ### Neverallow rules
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