tree a3f53eca31f8029548d191a151c4dbb857acd34e
parent 6eb4671d348760b1804c1ec9ff5361739a8d972f
author zhufl <zhu.fanglei@zte.com.cn> 1484031225 +0800
committer zhufl <zhu.fanglei@zte.com.cn> 1484556581 +0800

Add generate_random_security_group_id in BaseSecurityGroupsTest

This is to add generate_random_security_group_id in BaseSecurityGroupsTest,
so that all security_group tests can use it.
Besides, currently there are two functions which are used to generate
not_existing_id(_generate_a_non_existent_security_group_id and
not_existing_id), because generally speaking, rand_uuid or rand_int_id
can seldom be same, so we can use the simple way to generate
not_existing_id.

Change-Id: Ib6118c74ac080b3fdd7f1e77ac37f24792793d57