Implemet HASSH

[gallypette]

https://github.com/salesforce/hassh
It's a MD5 hash of the content of Algorithm Negotiation packets.
See in cowrie:

        ckexAlgs = ','.join([alg.decode('utf-8') for alg in kexAlgs])
        cencCS = ','.join([alg.decode('utf-8') for alg in encCS])
        cmacCS = ','.join([alg.decode('utf-8') for alg in macCS])
        ccompCS = ','.join([alg.decode('utf-8') for alg in compCS])
        hasshAlgorithms = "{kex};{enc};{mac};{cmp}".format(
            kex=ckexAlgs,
            enc=cencCS,
            mac=cmacCS,
            cmp=ccompCS)
        hassh = md5(hasshAlgorithms.encode('utf-8')).hexdigest()