[autotest] Rename apache_error_stats -> apache_error_log_metrics.

For backwards compatibility, create a symlink for apache_error_stats.py
to the new file.

BUG=chromium:720139
TEST=tests pass.

Change-Id: If9c031ec5a1675a4eb9c103c32a1a0094230cb0d
Reviewed-on: https://chromium-review.googlesource.com/500994
Commit-Ready: Paul Hobbs <phobbs@google.com>
Tested-by: Paul Hobbs <phobbs@google.com>
Reviewed-by: Paul Hobbs <phobbs@google.com>
Reviewed-by: Aviv Keshet <akeshet@chromium.org>
diff --git a/site_utils/stats/apache_error_stats.py b/site_utils/stats/apache_error_log_metrics.py
similarity index 100%
rename from site_utils/stats/apache_error_stats.py
rename to site_utils/stats/apache_error_log_metrics.py
diff --git a/site_utils/stats/apache_error_stats_unittest.py b/site_utils/stats/apache_error_log_metrics_unittest.py
similarity index 85%
rename from site_utils/stats/apache_error_stats_unittest.py
rename to site_utils/stats/apache_error_log_metrics_unittest.py
index 3b94563..7980fa3 100644
--- a/site_utils/stats/apache_error_stats_unittest.py
+++ b/site_utils/stats/apache_error_log_metrics_unittest.py
@@ -1,11 +1,11 @@
-"""Tests for mysql_stats."""
+"""Tests for apache_error_log_metrics."""
 
 import os
 import unittest
 
 import common
 
-import apache_error_stats
+import apache_error_log_metrics
 
 
 class ApacheErrorTest(unittest.TestCase):
@@ -22,16 +22,16 @@
         ]
         for line in lines:
           self.assertEqual(
-              None, apache_error_stats.ERROR_LOG_MATCHER.match(line))
+              None, apache_error_log_metrics.ERROR_LOG_MATCHER.match(line))
 
     def testMatchingLines(self):
         """Test for lines that are expected to match the format."""
-        match = apache_error_stats.ERROR_LOG_MATCHER.match(
+        match = apache_error_log_metrics.ERROR_LOG_MATCHER.match(
             "[foo] [:bar] [pid 123] WARNING")
         self.assertEqual('bar', match.group('log_level'))
         self.assertEqual(None, match.group('mod_wsgi'))
 
-        match = apache_error_stats.ERROR_LOG_MATCHER.match(
+        match = apache_error_log_metrics.ERROR_LOG_MATCHER.match(
             "[foo] [:bar] [pid 123] mod_wsgi (pid=123)")
         self.assertEqual('bar', match.group('log_level'))
         self.assertEqual('od_wsgi', match.group('mod_wsgi'))
@@ -41,7 +41,7 @@
         with open(os.path.join(os.path.dirname(__file__),
                                'apache_error_log_example.txt')) as fh:
           example_log = fh.readlines()
-        matcher_output = [apache_error_stats.ERROR_LOG_MATCHER.match(line)
+        matcher_output = [apache_error_log_metrics.ERROR_LOG_MATCHER.match(line)
                           for line in example_log]
         matched = filter(bool, matcher_output)
         self.assertEqual(5, len(matched))
diff --git a/site_utils/stats/apache_error_stats.py b/site_utils/stats/apache_error_stats.py
new file mode 120000
index 0000000..689b8a8
--- /dev/null
+++ b/site_utils/stats/apache_error_stats.py
@@ -0,0 +1 @@
+apache_error_log_metrics.py
\ No newline at end of file