John Perkins 33664e472a Fix hostname regex pattern
Current hostname_pattern regex complexity grows exponentially
when given a string of just digits, which can be exploited to
cause neutron-server to freeze.

Change-Id: I886c6d883a9cb0acd9908495eec50bf0411d8ba8
Closes-bug: #1378450
2014-11-19 15:01:19 +00:00
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