Test: handle new osx 'leaks' error.

Sometimes the process is still there but no longer in a state that can
be checked (after being killed). This used to happen after a call to
SHUTDOWN NOSAVE in the scripting unit, causing a false positive.

Author: antirez

tests/support/server.tcl

@@ -40,7 +40,8 @@ proc kill_server config {
                     test "Check for memory leaks (pid $pid)" {
                         set output {0 leaks}
                         catch {exec leaks $pid} output
-                        if {[string match {*process does not exist*} $output]} {
+                        if {[string match {*process does not exist*} $output] ||
+                            [string match {*cannot examine*} $output]} {
                             # In a few tests we kill the server process.
                             set output "0 leaks"
                         }