Revert "Make mediaserver enforcing."

Too many bugs.

This reverts commit cc9645436f6eb49d7e6b903af92379b942cc0fa7.
Revert "Make ping enforcing."

Causing adbd to run at 100% cpu utilization when the following
sequence of commands are run:

1) Run the command "adb shell ping -c 1 -w 5 www.google.com" for 5 times
2) Run "adb shell top -m 5"

The following denial occurs:

<5>[   20.647559] type=1400 audit(1389054327.861:21): avc:  denied  { sigchld } for  pid=1989 comm="adbd" scontext=u:r:ping:s0 tcontext=u:r:adbd:s0 tclass=process

Reverting for now.

This reverts commit 1b556c3270b3af0d2123901f7b31e105bb22f8fe.

Bug: 12251052
Change-Id: I1b9920624f49b0aed2226c41a45005aff228d9e8
Address adb backup/restore denials.

Resolves the following denials seen during an adb backup and restore
sequence.

<5>[   90.247039] type=1400 audit(1388759567.693:16): avc:  denied  { getopt } for  pid=3503 comm="Thread-149" scontext=u:r:system_server:s0 tcontext=u:r:adbd:s0 tclass=unix_stream_socket
<5>[   90.249176] type=1400 audit(1388759567.703:17): avc:  denied  { getopt } for  pid=2334 comm="app_process" scontext=u:r:shell:s0 tcontext=u:r:adbd:s0 tclass=unix_stream_socket

Change-Id: I1f6f90f29eecc32ee692764b04b812988f099cde
Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>