[Testfix] Fix I/O logic to use distinct file names

Problem:
Testcases test_mount_snap_delete and test_restore_online_vol
were failing in the latest runs with the below traceback
```
Traceback (most recent call last):
  File "/usr/share/glustolibs/io/scripts/file_dir_ops.py", line 1246, in <module>
    rc = args.func(args)
  File "/usr/share/glustolibs/io/scripts/file_dir_ops.py", line 374, in create_files
    base_file_name, file_types)
  File "/usr/share/glustolibs/io/scripts/file_dir_ops.py", line 341, in _create_files
    ret = pool.map(lambda file_tuple: _create_file(*file_tuple), files)
  File "/usr/lib64/python3.6/multiprocessing/pool.py", line 266, in map
    return self._map_async(func, iterable, mapstar, chunksize).get()
  File "/usr/lib64/python3.6/multiprocessing/pool.py", line 644, in get
    raise self._value
  File "/usr/lib64/python3.6/multiprocessing/pool.py", line 119, in worker
    result = (True, func(*args, **kwds))
  File "/usr/lib64/python3.6/multiprocessing/pool.py", line 44, in mapstar
    return list(map(*args))
  File "/usr/share/glustolibs/io/scripts/file_dir_ops.py", line 341, in <lambda>
    ret = pool.map(lambda file_tuple: _create_file(*file_tuple), files)
  File "/usr/share/glustolibs/io/scripts/file_dir_ops.py", line 270, in _create_file
    with open(file_abs_path, "w+") as new_file:
FileExistsError: [Errno 17] File exists: '/mnt/testvol_distributed_glusterfs/file1.txt'
```
This was because I/O logic was trying to create 2 files with the same
name from 2 clients.

Fix:
Modify logic to use counters to create files with different names.

Change-Id: I2896736d28f6bd17435f941088fd634347e3f4fd
Signed-off-by: kshithijiyer <kshithij.ki@gmail.com>

0 files changed, 0 insertions, 0 deletions