logd: start logd services in logd gid

logd - start as root:logd+system+readproc
logd-reinit - start as logd:logd

ToDo: start as logd:logd+system+readproc (libminijail)
Test: gTest logd-unit-tests, liblog-unit-tests and logcat-unit-tests
Bug: 32450474
Change-Id: I42c806ca1730a7f9eb9e34f064ae31a2ef9fc678
diff --git a/logd/logd.rc b/logd/logd.rc
index 5fc92e1..aecc4be 100644
--- a/logd/logd.rc
+++ b/logd/logd.rc
@@ -4,10 +4,12 @@
     socket logdw dgram 0222 logd logd
     file /proc/kmsg r
     file /dev/kmsg w
-    group root system readproc
+    group logd system readproc
     writepid /dev/cpuset/system-background/tasks
 
 service logd-reinit /system/bin/logd --reinit
     oneshot
     disabled
+    user logd
+    group logd
     writepid /dev/cpuset/system-background/tasks