testenv: typo and style fix.

* testenv/server/http/http_server.py(BaseTest): Add docstring; use raw
string for regex.
* testenv/server/http/http_server.py(_Handler): Typo fix.
* testenv/conf/server_files.py(ServerFiles): Code style change for
readability plus another typo fix.

testenv/conf/server_files.py

@@ -3,7 +3,7 @@ from conf import hook
 """ Pre-Test Hook: ServerFiles
 This hook is used to define a set of files on the server's virtual filesystem.
 server_files is expected to be dictionary that maps filenames to their
-contents. In the future, this can be used to add additional metadat to the
+contents. In the future, this can be used to add additional metadata to the
 files using the WgetFile class too.
 
 This hook also does some additional processing on the contents of the file. Any
@@ -19,8 +19,8 @@ class ServerFiles:
 
     def __call__(self, test_obj):
         for server, files in zip(test_obj.servers, self.server_files):
-            rules = {f.name: test_obj.get_server_rules(f)
+            files_content = {f.name: test_obj._replace_substring(f.content)
                      for f in files}
-            files = {f.name: test_obj._replace_substring(f.content)
+            files_rules = {f.name: test_obj.get_server_rules(f)
                      for f in files}
-            server.server_conf(files, rules)
+            server.server_conf(files_content, files_rules)

testenv/server/http/http_server.py

@@ -368,7 +368,7 @@ class _Handler (BaseHTTPRequestHandler):
                     assert hasattr (self, rule_name)
                     getattr (self, rule_name) (self.rules [rule_name])
                 except AssertionError as ae:
-                    msg = "Method " + rule_name + " not defined"
+                    msg = "Rule " + rule_name + " not defined"
                     self.send_error (500, msg)
                     return (None, None)
                 except ServerError as se:
@@ -399,7 +399,7 @@ class _Handler (BaseHTTPRequestHandler):
                                                       content_length))
                 content_length -= self.range_begin
             cont_type = self.guess_type (path)
-            self.send_header ("Content-type", cont_type)
+            self.send_header ("Content-Type", cont_type)
             self.send_header ("Content-Length", content_length)
             self.finish_headers ()
             return (content, self.range_begin)

testenv/test/base_test.py

@@ -175,7 +175,10 @@ class BaseTest:
         self.hook_call(self.post_configs, 'Post Test Function')
 
     def _replace_substring (self, string):
-        pattern = re.compile ('\{\{\w+\}\}')
+        """
+        Replace first occurrence of "{{name}}" in @string with "getattr(self, name)".
+        """
+        pattern = re.compile (r'\{\{\w+\}\}')
         match_obj = pattern.search (string)
         if match_obj is not None:
             rep = match_obj.group()