Address healthd denials.

Resolve denials such as:
avc:  denied  { write } for  pid=130 comm="healthd" name="state" dev="sysfs" ino=57 scontext=u:r:healthd:s0 tcontext=u:object_r:sysfs:s0 tclass=file
avc:  denied  { read write } for  pid=130 comm="healthd" name="tty0" dev="tmpfs" ino=5677 scontext=u:r:healthd:s0 tcontext=u:object_r:tty_device:s0 tclass=chr_file

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

(cherry picked from commit ebc08e82)

Change-Id: Ib72388cc2d192fe78397e3a2a401db08b5b6c267