i#6662 public traces: allow v2p.textproto in trace dir

Allows the v2p.textproto file to be in the trace directory
of public traces to avoid the following error:
```
$ drrun -t drmemtrace -indir ${path_to_public_trace_dir} -tool invariant_checker
Invalid header
Failed to initialize scheduler: Failed to open <OMITTED>/v2p.textproto
ERROR: failed to initialize analyzer
```

Issue #6662

clients/drcachesim/scheduler/scheduler_impl.cpp

@@ -1686,7 +1686,7 @@ scheduler_impl_tmpl_t<RecordType, ReaderType>::open_readers(
         // Skip the auxiliary files.
         if (fname == DRMEMTRACE_MODULE_LIST_FILENAME ||
             fname == DRMEMTRACE_FUNCTION_LIST_FILENAME ||
-            fname == DRMEMTRACE_ENCODING_FILENAME)
+            fname == DRMEMTRACE_ENCODING_FILENAME || fname == DRMEMTRACE_V2P_FILENAME)
             continue;
         const std::string file = path + DIRSEP + fname;
         files.push_back(file);