REGTEST: Fix a typo about barrier type.

Fix a typo, furthermore there is no reason to use a barrier with "sock" as type
which are more varnish cache specific: used to synchronize the VCL.
diff --git a/reg-tests/checks/s00000.vtc b/reg-tests/checks/s00000.vtc
index 35d0a98..0aae83a 100644
--- a/reg-tests/checks/s00000.vtc
+++ b/reg-tests/checks/s00000.vtc
@@ -18,7 +18,7 @@
 # before enabling the servers.
 
 # Cyclic barrier to synchonize the CLI with the syslog servers
-barrier b1 sock 5 -cyclic
+barrier b1 cond 5 -cyclic
 
 # These servers are there only for the health-check test.
 server s1 {