Check to see if a security group exists.

    CLI example::

        salt myminion boto_secgroup.exists mysecgroup

def exists(name=None, region=None, key=None, keyid=None, profile=None,
           vpc_id=None, vpc_name=None, group_id=None):
    '''
    Check to see if a security group exists.

    CLI example::

        salt myminion boto_secgroup.exists mysecgroup
    '''
    conn = _get_conn(region=region, key=key, keyid=keyid, profile=profile)

    group = _get_group(conn, name=name, vpc_id=vpc_id, vpc_name=vpc_name,
                       group_id=group_id, region=region, key=key, keyid=keyid,
                       profile=profile)
    if group:
        return True
    else:
        return False