valgrind: Adjust filter for _dl_allocate_tls

More tests are now using the path - adjust the filter to include any
path from a test through pthread_create to _dl_allocate_tls

tests/.valgrind.supp

@@ -62,14 +62,16 @@
     obj:*/lib*/libc-2.*so*
 }
 #
-# Failure seen in eventtest
+# Failure seen in eventtest, qemumonitorjsontest, qemuhotplugtest,
+#                 qemuagenttest
 #
 {
-    eventtestMemoryLeak
+    dlAllocateTlsMemoryLeak
     Memcheck:Leak
     fun:calloc
     fun:_dl_allocate_tls
     fun:pthread_create*
+    ...
     fun:mymain
     fun:virtTestMain
     ...