Remove hyphen from rand_name calls in volume tests

data_utils.rand_name() appends randam charactors with a hypen like:

 def rand_name(name=''):
     randbits = str(random.randint(1, 0x7fffffff))
     if name:
         return name + '-' + randbits

So it is not necessary to specify a hypen in caller side.
This patch removes a hypen in volume tests.

Change-Id: I1ea38961053cf751b14e261321d6695a8c11dd54
10 files changed