Source config/localcfg.exp if it exists.

src/server/testsuite/config/unix.exp

+# The values in this file can be overridden by creating localcfg.exp 
+# and setting them there.  This is useful if you are working against
+# the CVS repository and make a purely local change (such as setting
+# the timeout value to a low value).
+
 # Set this to 1 to cause the test suite to wait while you attach to
 # the process that is being tested.
 
@@ -1239,3 +1244,9 @@ proc dump_statistics {} {
 
     system "kill -USR1 $lyskomd_pid"
 }
+
+# If you want to override the timeout or some other values, you
+# can do so by creating "localcfg.exp" in the build tree.
+if {[file exists "config/localcfg.exp"]} {
+    source "config/localcfg.exp"
+}