Fix ipadiscovery

[alex-zel]

Sort SRV records for LDAP/KRB based on priority.

[tiran]

You can simplify your code a lot with the operator module and sorted(key) trick:

https://docs.python.org/3/library/operator.html#operator.attrgetter
https://docs.python.org/3/library/functions.html#sorted

import operator

answers = resolver.query(qname, rdatatype.SRV)
answers = sorted(answer, key=operator.attrgetter('priority'))

Please squash your changes into one commit.

[martbab]

Hi Alex, a few comments:

1.) please see PEP8 guide for correct Python formatting https://www.python.org/dev/peps/pep-0008/ namely, do not use tabs but 4 spaces for indentation.

2.) I do not see much value in sorting TXT records. We are searching for _kerberos TXT record which should occur only once in DNS domain.

3.) please use a more concise sorting mechanism mentioned by @tiran, your way is very unpythonic and inefficient (list insertions).

[MartinBasti]

You changed TXT to SRV here. It should stay TXT RR and it has no priority attribute