This allows a user to exclusively enter a bot's name or a bot's
directory as the first and only positional argument. Therefore,
no complicated checks for multiple bot specifications are required
anymore.
Additionally, this cleans help messages and makes arguments more
accessible.
If a user provides both the name and the path to the bot
as input then we either will have to chose one of them
or alert the user to check the input. Selecting the latter
by sending an error message to the user.
Very few bots like followup bot directly call 'send_message'
function from the bot code. Since ExternalBotHandler class is
mocked, we'll have to mock 'send_message' function as well.
Added dummy field value of 'sender_email' for the message to be
as followup bot requires that field while processing
the message.
Since send_message is directly called from a specific bot's code,
so it can be sent to a different stream or under a different topic
than that of the incoming message. So, print the entire message
along with stream name.
A bot calling 'send_reply' function will reply to the incoming
message in the same stream under the same topic. So, only printing
bot's response message content for that.
This eliminates the need to setup dev environment and to
create a bot, setup zuliprc file, subscribe the bot to the
stream in order to try out a bot.
Manual command get-bot-output gives the bots response content
directly.
