Omit any SELinux trailing dot from ls to fix test.

[schmonz]

I saw these test failures on at least CentOS 6 and 7:

@@ -269,16 +269,16 @@
 test.sv: down ok
 test.sv log: down ok
 --- supervise leaves locked service intact
-prw------- 0 control
--rw------- 0 lock
-prw------- 0 ok
--rw-r--r-- 20 status
+prw-------. 0 control
+-rw-------. 0 lock
+prw-------. 0 ok
+-rw-r--r--. 20 status
 supervise: fatal: unable to acquire supervise/lock: temporary failure
 111
-prw------- 0 control
--rw------- 0 lock
-prw------- 0 ok
--rw-r--r-- 20 status
+prw-------. 0 control
+-rw-------. 0 lock
+prw-------. 0 ok
+-rw-r--r--. 20 status
 0
 test.sv: supervise not running
 0

The trailing . evidently means a file has some SELinux context (which can then be viewed with ls -Z). For this test's purposes, we can just leave it out.