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Description of problem:
ipa-advise on a RHEL7 IdM server generate a configuration script for client having hardcoded python3

As a result, if client machine does not have python3 installed, it gives error like:

/root/config-client-for-smart-card-auth.sh: line 90: python3: command not found

Version-Release number of selected component (if applicable):
ipa-server-4.6.8-2.el7.x86_64

How reproducible:
always.

Steps to Reproduce:
1. Install RHEL7.8 IPA server and configure to user smart card
2. Install RHEL8 client against RHEL7 server and configure to user smart card[1]
3. The bash script should run successfully on RHEL8 client 


[1] https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/configuring_and_managing_identity_management/configuring-idm-for-smart-card-auth_configuring-and-managing-idm

Actual results:
/root/config-client-for-smart-card-auth.sh: line 90: python3: command not found

Expected results:
No error

Additional info:
https://github.com/freeipa/freeipa/blob/ipa-4-6/ipaserver/advise/plugins/smart_card_auth.py#L353

Correction in step1.

1. Install RHEL7.9 IPA server and configure to user smart card

The script should be able to run without issue on rhel7, rhel8, or any fedora version.
- on rhel7, there is no /usr/bin/authselect, meaning the line with python3 -c ... doesn't get called -> OK
- on fedora without authselect, the line doesn't get called -> OK
- on fedora28+ with authselect, ipa-4-7 is used and this version enforces python3 -> OK
- on rhel8, python3 should not be used and /usr/libexec/platform-python should be used instead

Upstream ticket:
https://pagure.io/freeipa/issue/8311

Fixed upstream
master:
https://pagure.io/freeipa/c/edcfba6010c0b6a81841ca6e1e478835ce76191b

Fixed upstream
ipa-4-8:
https://pagure.io/freeipa/c/787ce4555a203bd3f31c1f6cc577855f779fe6cf
ipa-4-6:
https://pagure.io/freeipa/c/3754f686d1ac609b98c35e8c2aa9f0450b08287e

Created attachment 1689580 [details]
report.html

Automation passed. Hence marking the bug as verified.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (Moderate: ipa security, bug fix, and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2020:3936