hgweb: make the test suite use hgweb in a more WSGI compliant way

- as checked by wsgiref.validate.

This makes sure that we don't optimize hgweb for invalid use cases.

tests/test-extension.t

@@ -112,7 +112,8 b" Check hgweb's load order:"
   > wsgicgi.launch(application)
   > EOF
 
-  $ SCRIPT_NAME='/' SERVER_PORT='80' SERVER_NAME='localhost' python hgweb.cgi \
+  $ REQUEST_METHOD='GET' PATH_INFO='/' SCRIPT_NAME='' QUERY_STRING='' \
+  >    SERVER_PORT='80' SERVER_NAME='localhost' python hgweb.cgi \
   >    | grep '^[0-9]) ' # ignores HTML output
   1) foo imported
   1) bar imported

tests/test-hgweb-no-path-info.t

@@ -39,6 +39,7 b' should be used from d74fc8dec2b4 onward '
   >     'wsgi.multiprocess': False,
   >     'wsgi.run_once': False,
   >     'REQUEST_METHOD': 'GET',
+  >     'PATH_INFO': '/',
   >     'SCRIPT_NAME': '',
   >     'SERVER_NAME': '127.0.0.1',
   >     'SERVER_PORT': os.environ['HGPORT'],
@@ -49,6 +50,7 b' should be used from d74fc8dec2b4 onward '
   >     content = app(env, startrsp)
   >     sys.stdout.write(output.getvalue())
   >     sys.stdout.write(''.join(content))
+  >     getattr(content, 'close', lambda : None)()
   >     print '---- ERRORS'
   >     print errors.getvalue()
   > 
@@ -101,7 +103,7 b' should be used from d74fc8dec2b4 onward '
   [('Content-Type', 'text/plain; charset=ascii')]
   ---- DATA
   
-  repo/
+  /repo/
   
   ---- ERRORS
   

tests/test-hgweb-no-request-uri.t

@@ -49,6 +49,7 b' should be used from d74fc8dec2b4 onward '
   >     content = app(env, startrsp)
   >     sys.stdout.write(output.getvalue())
   >     sys.stdout.write(''.join(content))
+  >     getattr(content, 'close', lambda : None)()
   >     print '---- ERRORS'
   >     print errors.getvalue()
   >