Feature: Add stdin_input option in winrm.Session.run_cmd and winrm.Session.run_ps

[mypaceshun]

Hello,
First of all, thank you for creating pywinrm.

The send_command_input function is added #271.
This function is very useful for sending data to stdin of remote commands.
I have made send_command_input function available from winrm.Session.

This PR add new option stdin_input to winrm.Session.run_cmd and winrm.Session.run_ps.

• When stdin_input is None, send_command_input is not called
• When stdin_input is str or bytes, send_command_input is called after run_command

Example for sending data to stdin

Before

import winrm

session = winrm.Session("win-server", ("user", "pass"))
shell_id = session.protocol.open_shell()
command_id = session.protocol.run_command(shell_id, "command")
session.protocol.send_command_input(shell_id, command_id, "input data", True)
std_out, std_err, status_code = session.protocol.get_command_output(shell_id, command_id)

session.protocol.cleanup_command(shell_id, command_id)
session.protocol.close_shell(shell_id)

print(std_out)

After

import winrm

session = winrm.Session("win-server", ("user", "pass"))
response = session.run_cmd("command", stdin_input="input data")

print(response.std_out)