Fix PYTHONHASHSEED bugs in test_security_groups_rpc

This fixes the test_security_groups_rpc unit test that breaks with a
randomized PYTHONHASHSEED (see the bug report).

The test assumed that several Dicts had elements in a particular order.
Found with PYTHONHASHSEED=2701526934.

The fix refactors the test case by using an OrderedDict instead of a Dict.
Or in the case of the regex strings, injecting different values depending
on the order of the devices2 and devices3 Dicts.

An upstream spelling mistake is also addressed in this patch.

Partial-bug: #1348818

Note: There are several other unrelated unit tests that also break with a
randomized PYTHONHASHSEED, but they are not addressed here. They will be
addressed in separate patches.

Change-Id: I744117edfc5869b0750349a89f2792f622e4285d
Merge "Fix PYTHONHASHSEED bugs in test_security_groups_rpc"