Use -a flag with stats commands

Change-Id: Ifc6385f59ec4b5f999a4027de2d8b8b8a46a5e7d
Reviewed-on: http://review.membase.org/3252
Reviewed-by: Dustin Sallings <dustin@spy.net>
Tested-by: Dustin Sallings <dustin@spy.net>

collect_info

@@ -175,19 +175,19 @@ _tasks = [
     UnixTask("System log", "/var/adm/messages"),
     UnixTask("Kernel log buffer", "dmesg"),
     AllOsTask("memcached stats all",
-              "stats localhost:11210 all _admin _admin",
+              "stats -a localhost:11210 all _admin _admin",
               log_file="stats.log"),
     AllOsTask("memcached stats dispatcher",
-              "stats localhost:11210 dispatcher _admin _admin",
+              "stats -a localhost:11210 dispatcher _admin _admin",
               log_file="stats.log"),
     AllOsTask("memcached stats hash",
-              "stats localhost:11210 hash _admin _admin",
+              "stats -a localhost:11210 hash _admin _admin",
               log_file="stats.log"),
     AllOsTask("memcached stats tap",
-              "stats localhost:11210 tap _admin _admin",
+              "stats -a localhost:11210 tap _admin _admin",
               log_file="stats.log"),
     AllOsTask("memcached stats timings",
-              "stats localhost:11210 timings _admin _admin",
+              "stats -a localhost:11210 timings _admin _admin",
               log_file="stats.log"),
     AllOsTask("membase logs", "browse_logs", log_file="ns_server.log"),
     ]