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
3 files changed