[SSSD] [sssd PR#5546][comment] kcm: add GET_CRED_LIST for faster iteration

[sumit-bose]

  URL: https://github.com/SSSD/sssd/pull/5546
Title: #5546: kcm: add GET_CRED_LIST for faster iteration

sumit-bose commented:
"""
Hi,

the patches work well for me.

The feature is already covered by the current KCM integration tests, i.e. if the krb5
client library supports the extension it will be used in the tests. However there is no
indication in the tests if the GET_CRED_LIST or GET_CRED_UUID_LIST is used. I wonder if it
would be good to have such indication to avoid regressions on platform where we know that
the extension is supported?

About `KCM_MIT_OFFSET`, I think it would be worth to add a comment explaining where this
is coming from, e.g. that it is the opcode of the first call of the MIT extension.

bye,
Sumit
"""

See the full comment at https://github.com/SSSD/sssd/pull/5546#issuecomment-810092973