minor updates to systemtestlib and fixture data

This commit provides a new function in the systemtestlib that will sort a
dict by its keys.  This method only sorts the first level keys and is
designed to support comparing dicts as equal in unit tests

It also adds username configuration to the running_config.text fixture

Both of these changes are to support the system and unit tests for the users
api module

test/fixtures/running_config.text

@@ -349,7 +349,10 @@ no aaa authorization policy local default-role
 !
 username admin privilege 1 role network-admin nopassword
 username eapi privilege 1 secret 5 $1$eCurfHLe$JCbuUNM7Xwy6i6/zknYha.
-username sprygada privilege 1 nopassword
+username test privilege 10 nopassword
+username test1 privilege 1 secret 5 $1$o/po05ru$92uegC/GGu3i4MS7MH9AE0
+username test2 privilege 9 role ops secret 5 $1$Kraw0Knu$dfIURYuRCxzDDcyyKnAD1/
+username test3 privilege 9 role ops nopassword
 !
 role network-admin
    10 permit command .*

test/lib/systestlib.py

@@ -31,6 +31,7 @@
 #
 import unittest
 import random
+import collections
 
 from testlib import get_fixture
 
@@ -52,6 +53,11 @@ def setUp(self):
                 name = name.split(':')[1]
                 self.duts.append(pyeapi.client.connect_to(name))
 
+    def sort_dict_by_keys(self, d):
+        keys = sorted(d.keys())
+        return dict([(k, d[k]) for k in keys])
+
+
 def random_interface(dut, exclude=None):
     exclude = [] if exclude is None else exclude
     interfaces = dut.api('interfaces')