Create a display name for a key.

    CLI example::

        salt myminion boto_kms.create_alias 'alias/mykey' key_id

def create_alias(alias_name, target_key_id, region=None, key=None, keyid=None,
                 profile=None):
    '''
    Create a display name for a key.

    CLI example::

        salt myminion boto_kms.create_alias 'alias/mykey' key_id
    '''
    conn = _get_conn(region=region, key=key, keyid=keyid, profile=profile)

    r = {}
    try:
        conn.create_alias(alias_name, target_key_id)
        r['result'] = True
    except boto.exception.BotoServerError as e:
        r['result'] = False
        r['error'] = __utils__['boto.get_error'](e)
    return r