Move creating server group from resource_setup to setUp
Move creating server group from resource_setup to setUp

After microversion 2.13 'project_id' and 'user_id' are added to
the body of server group, but in resource_setup microversion is
not used, so server group created in resource_setup doesn't contain
'project_id' and 'user_id', which will cause MismatchError:
MismatchError: !=:
reference = {u'id': u'09b0b4e0-d886-4bb9-9193-6faab4f0cbc8',
 u'members': [],
 u'metadata': {},
 u'name': u'tempest-ServerGroupTestJSON-Server-Group-1629494857',
 u'policies': [u'affinity']}
actual = {u'id': u'09b0b4e0-d886-4bb9-9193-6faab4f0cbc8',
 u'members': [],
 u'metadata': {},
 u'name': u'tempest-ServerGroupTestJSON-Server-Group-1629494857',
 u'policies': [u'affinity'],
 u'project_id': u'8f3f6b0bd14047b68d267d58909c8f43',
 u'user_id': u'fb05421f04cb46bd81873c4fc314ed7f'}

This is to move the creating of common server group from
resource_setup to setUp, so that microversion can be used.

Change-Id: I94c6b8276c413839cda019e5d702f26bf1acb110
Closes-Bug: #1783258

cisco-openstack/tempest,cisco-openstack/tempest,masayukig/tempest,openstack/tempest,openstack/tempest,masayukig/tempest