Use net_domain() macro for netmgrd domain.
Use net_domain() macro for netmgrd domain.

Addresses denials such as:
avc: denied { create } for comm="netmgrd" scontext=u:r:netmgrd:s0 tcontext=u:r:netmgrd:s0 tclass=rawip_socket

Remove redundant rules/permissions covered by net.te.

Change-Id: If9726cf1bf482680f9231f88cd52d6f1e2a625e0
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