[bug 1025925] Change instances of of util relating to fjord/base/util.py

Changed the instances in these files (on specified lines):
fjord/feedback/views.py - line 15
fjord/heartbeat/views.py - line 4
fjord/search/management/commands/esstatus.py - line 3
fjord/translations/admin.py - line 13
fjord/translations/tasks.py - line 5
fjord/analytics/analyzer_views.py - line 34
fjord/analytics/tests/test_tools.py - line 7
fjord/analytics/utils.py (renamed from tools.py to utils.py) - line 5
fjord/analytics/views.py - line 28
fjord/base/tests/test__util.py - line 9
fjord/events/views.py - line 5
fjord/feedback/api_views.py - line 11
fjord/feedback/models.py - line 16
fjord/base/validators.py - line 4