This change ads sudo to group calls

[WinstonN]

This PR was created from the discussion here: #1912 (comment)

I created this PR in the hope that we could get some traction into bringing this feature into Fabric 2
Sudo calls in group still suffers from this issue: #2051

Code used for testing

def get_config():
    """
    Set correct config for connections
    """
    config = Config(
        runtime_ssh_path='/path/to/.ssh/config.d/unicorn',
        overrides={
            'sudo': {
                'user': 'www'
            }
        }
    )
    return config


def setup_host_group(context, environment, filter, tags='private_ip_address'):
    """
    Setup hosts group from EC2 instances using boto3
    """
    hosts = extract_instances_information(context, environment, filter, tags)
    config = get_config()
    connection = [Connection(host=host, config=config) for host in hosts]

    return connection


@task
def exec(context, environment, filter, command):
    """
    Execute command on systems
    :param environment: The environment to target (Staging, Development, Production)
    :param filter: The filter wildcard string to run the commands on some hosts
    :param command: The command to execute
    """
    # run way (without sudo in ThreadingGroup)
    # hosts = extract_instances_information(context, environment, filter, tags='private_ip_address')
    # config = get_config()

    # for host in hosts:
    #     c = Connection(host=host, config=config)
    #     c.sudo(command)

    connection = setup_host_group(context, environment, filter)
    group = ThreadingGroup.from_connections(connection)
    
    try:
        group.sudo(command)
    except exceptions.GroupException as e:
        pass

Output is:

❯❯❯ fab exec -e stg -f "Web" -c "whoami; id; pwd;"
---
Your current IP Address is:
ip.ad.dre.ss
---
Targeting environment [stg] with filter 'Web'
Information for attributes: ['private_ip_address']
Found 2 host(s)
[
    "10.0.0.1",
    "10.0.0.2"
]
www
uid=500(ec2-user) gid=500(ec2-user) groups=500(ec2-user),10(wheel)
/home/ec2-user
www
uid=500(ec2-user) gid=500(ec2-user) groups=500(ec2-user),10(wheel)
/home/ec2-user

[akiuni]

Hello, I'm not used to git developpemen (PR is a strange word for me), feel free to tell me if I can help

[bitprophet]

Went with a different approach on my end that's a bit less copy/paste, but thanks anyway! Crediting in changelog :) See #1999 for the core ticket on this as well.