REGTEST: Be less Linux specific with a syslog regex.

This patch makes at least this test pass on FreeBSD systems.
The regex to be matched with syslog message was too much Linux specific.
diff --git a/reg-tests/checks/s00003.vtc b/reg-tests/checks/s00003.vtc
index b57b965..6ce10b0 100644
--- a/reg-tests/checks/s00003.vtc
+++ b/reg-tests/checks/s00003.vtc
@@ -27,7 +27,7 @@
     recv
     expect ~ "[^:\\[ ]\\[${h1_pid}\\]: Proxy be3 started"
     recv
-    expect ~ "[^:\\[ ]\\[${h1_pid}\\]: Health check for server be3/srv3 failed, reason: Layer4 connection problem, info: \"General socket error \\(Network is unreachable\\)\", check duration: [[:digit:]]+ms, status: 0/1 DOWN."
+    expect ~ "[^:\\[ ]\\[${h1_pid}\\]: Health check for server be3/srv3 failed, reason: Layer4 .* check duration: [[:digit:]]+ms, status: 0/1 DOWN."
 } -start
 
 syslog S4 -level notice {