Update command line options for the codes workload mpi-replay tool

Modify the mpi-replay tool (located at tests/workload) to spit out
verbose information on each event it replays, if user specifies
-v option. Also, modify the mpi-replay tool to perform no-ops for
each replayed event, if user specifies --noop option. The replay
tool should function properly for all workload types now.

TODO: The tool should offer functionality for initializing the context
of the output replay directory. That is, the tool should first scan
the given workload and create all files and preallocate space for all
I/O ops in the workload. Currently, the replay tool will fail on any
files that are not explicitly created by the workload.

tests/workload/codes-workload-mpi-replay.c

@@ -43,10 +43,10 @@ void usage(char *exename)
 {
     fprintf(stderr, "Usage: %s [OPTIONS] --wkld-type <workload_type>\n       "
             "[--wkld-params <workload_params>] --test-dir <workload_test_dir>\n\n", exename);
-    fprintf(stderr, "\t<workload_type> is a valid codes workload generator name\n");
-    fprintf(stderr, "\t<workload_params> is parameters for the workload generator (possibly none)\n");
-    fprintf(stderr, "\t<workload_test_dir> is the directory to replay the workload I/O in\n");
-    fprintf(stderr, "\tOPTIONS includes:\n");
+    fprintf(stderr, "\t<workload_type> : a valid codes workload generator name\n");
+    fprintf(stderr, "\t<workload_params> : parameters for the workload generator (possibly none)\n");
+    fprintf(stderr, "\t<workload_test_dir> : the directory to replay the workload I/O in\n");
+    fprintf(stderr, "\n\t[OPTIONS] includes:\n");
     fprintf(stderr, "\t\t--noop : do not perform i/o\n");
     fprintf(stderr, "\t\t    -v : verbose (output i/o details)\n");   
 
@@ -61,7 +61,7 @@ void parse_args(int argc, char **argv, char **workload_type, char **workload_par
         {"wkld-type", 1, NULL, 't'},
         {"wkld-params", 1, NULL, 'p'},
         {"test-dir", 1, NULL, 'd'},
-        {"noop", 1, NULL, 'n'},
+        {"noop", 0, NULL, 'n'},
         {"help", 0, NULL, 0},
         {0, 0, 0, 0}
     };