swift 1.7.4 statsd sampling fix

swift-1.7.4-statsd-sampling.patch

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< from random import shuffle
---
> from random import random, shuffle
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>         self.random = random
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<             parts.append('@%s' % (sample_rate,))
---
>             if self.random() < sample_rate:
>                 parts.append('@%s' % (sample_rate,))
>             else:
>                 return
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<         with closing(socket.socket(socket.AF_INET, socket.SOCK_DGRAM)) as sock:
---
>         with closing(self._open_socket()) as sock:
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>     def _open_socket(self):
>         return socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
>