[Bug 1380150] [NEW] novaclient: security groups, should fail when creating security groups with duplicate name

[Behzad]

Public bug reported:

When creating a security group using the novaclient.security_groups
create API, there is not check which avoids creating security group if
one already exist. This later on poses a problem when trying to delete,
find the security group, which results in a NoUniqueMatch exception as
below.

It would be better if the API returned an error when creating a security
group with the same name.

       
======================================================================
ERROR: test_network_scenarios (__main__.NetworkScenarioTest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/xyz/code/install_oct10/pns/vmtp.py", line 359, in tearDown
    self.comp.security_group_delete()
  File "/home/xyz/code/install_oct10/pns/compute.py", line 183, in security_group_delete
    group = self.novaclient.security_groups.find(name=self.config.security_group_name)
  File "/home/xyz/env/env1/lib/python2.7/site-packages/novaclient/base.py", line 140, in find
    raise exceptions.NoUniqueMatch
NoUniqueMatch

** Affects: python-novaclient (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1380150

Title:
  novaclient: security groups, should fail when creating security groups
  with duplicate name

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