bots: Move contrib_bots to api/bots*.

This will make it convenient to include these bots in Zulip API
releases on pypi.

Fix #5009.

bots/helloworld/helloworld.py

@@ -0,0 +1,18 @@
+# See readme.md for instructions on running this code.
+
+
+class HelloWorldHandler(object):
+    def usage(self):
+        return '''
+        This is a boilerplate bot that responds to a user query with
+        "beep boop", which is robot for "Hello World".
+
+        This bot can be used as a template for other, more
+        sophisticated, bots.
+        '''
+
+    def handle_message(self, message, client, state_handler):
+        content = 'beep boop'
+        client.send_reply(message, content)
+
+handler_class = HelloWorldHandler

bots/helloworld/readme.md

@@ -0,0 +1,4 @@
+Simple Zulip bot that will respond to any query with a "beep boop".
+
+The helloworld bot is a boilerplate bot that can be used as a
+template for more sophisticated/evolved Zulip bots.

bots/helloworld/test_helloworld.py

@@ -0,0 +1,23 @@
+#!/usr/bin/env python
+
+from __future__ import absolute_import
+from __future__ import print_function
+
+import os
+import sys
+from six.moves import zip
+
+our_dir = os.path.dirname(os.path.abspath(__file__))
+sys.path.insert(0, os.path.normpath(os.path.join(our_dir)))
+# For dev setups, we can find the API in the repo itself.
+if os.path.exists(os.path.join(our_dir, '..')):
+    sys.path.insert(0, '..')
+from bots_test_lib import BotTestCase
+
+class TestHelloWorldBot(BotTestCase):
+    bot_name = "helloworld"
+
+    def test_bot(self):
+        txt = "beep boop"
+        messages = ["", "foo", "Hi, my name is abc"]
+        self.check_expected_responses(dict(list(zip(messages, len(messages)*[txt]))))