fix TypeError: 'itertools.imap' object has no attribute 'getitem'

[askbow]

We were having python exceptions like this:
TypeError: 'itertools.imap' object has no attribute 'getitem'

for lines

for mcs_octet in range(3, 7):
        
            mcs_octet_value = dot11_elt_dict[ht_capabilities][mcs_octet]

and

    # check if 11ac supported
    if vht_capabilities in dot11_elt_dict.keys():
        
        # Check for number streams supported
        mcs_upper_octet = dot11_elt_dict[vht_capabilities][5]
        mcs_lower_octet = dot11_elt_dict[vht_capabilities][4]

I.e. each element from dot11_elt_dict is an itertools.imap object, for example:
{'59': <itertools.imap object at 0xffff79cb4c10>, '48': <itertools.imap object at 0xffff79cb4950>, '33': <itertools.imap object at 0xffff79cb4890>, '45': <itertools.imap object at 0xffff79cb4a10>, '191': <itertools.imap object at 0xffff79cb4b10>, '36': <itertools.imap object at 0xffff79cb4910>, '1': <itertools.imap object at 0xffff79cb4810>, '0': <itertools.imap object at 0xffff79cb4790>, '127': <itertools.imap object at 0xffff79cb4a90>, '221': <itertools.imap object at 0xffff79cb4b90>, '220': <itertools.imap object at 0xffff79cb4c90>}

This fix creates lists needed and puts elements from itertools.imap objects onto these lists, preserving order.
We can then access the elements with [id] without producing an error.