sys-auth/sssd: CoreOSify the service

There is no need to fork the daemon with systemd, so run in the
foreground for Type=simple.  This also writes logs to stderr by
default, so this service no longer needs a special /var/log path.
The syslog.target unit does not exist either, but SSSD can
can optionally query NSCD, so order it after nscd.service.

sdk_container/src/third_party/coreos-overlay/sys-auth/sssd/files/sssd.service

@@ -1,15 +1,10 @@
 [Unit]
 Description=System Security Services Daemon
-# SSSD will not be started until syslog is
-After=syslog.target
+After=nscd.service
 
 [Service]
-ExecStart=/usr/sbin/sssd -D -f
-# These two should be used with traditional UNIX forking daemons
-# consult systemd.service(5) for more details
-Type=forking
+ExecStart=/usr/sbin/sssd -i
 PIDFile=/run/sssd.pid
 
 [Install]
 WantedBy=multi-user.target
-

sdk_container/src/third_party/coreos-overlay/sys-auth/sssd/files/tmpfiles.d/sssd.conf

@@ -4,4 +4,3 @@ d /var/lib/sss			-	root	root	-	-
 d /var/lib/sss/db		0700	root	root	-	-
 d /var/lib/sss/pipes		-	root	root	-	-
 d /var/lib/sss/pipes/private	0700	root	root	-	-
-d /var/log/sssd			0700	root	root	-	-