Make netmgrd enforcing.
Make netmgrd enforcing.

Now that we have allowed execution of external helpers and
have removed all dontaudit rules, make the netmgrd domain enforcing
again.

Change-Id: I0d0652ad51ff57ca8fd15a36f687063d248108a6
Signed-off-by: Stephen Smalley <d6e1285e1c84d3d5885c2124fdacc780e9fc0a94@tycho.nsa.gov>

maruos/android_device_lge_hammerhead,maruos/android_device_lge_hammerhead,maruos/android_device_lge_hammerhead,maruos/android_device_lge_hammerhead