Backport a bunch of upstream fixes
    
    - Resolves: upstream#3821 - crash related to sbus_router_destructor()
    - Resolves: upstream#3810 - sbus2: fix memory leak in sbus_message_bound_ref
    - Resolves: upstream#3819 - sssd only sets the SELinux login context if it
                                differs from the default
    - Resolves: upstream#3807 - The sbus codegen script relies on "python" which
                                might not be available on all distributions
    - Resolves: upstream#3820 - sudo: search with lower cased name for case
                                insensitive domains
    - Resolves: upstream#3701 - [RFE] Allow changing default behavior of SSSD from
                                an allow-any default to a deny-any default when it
                                can't find any GPOs to apply to a user login.
    - Resolves: upstream#3828 - Invalid domain provider causes SSSD to abort
                                startup
    - Resolves: upstream#3500 - Make sure sssd is a replacement for pam_pkcs11
                                also for local account authentication
    - Resolves: upstream#3812 - sssd 2.0.0 segfaults on startup
    - Resolves: upstream#3826 - Remove references of sss_user/group/add/del
                                commands in man pages since local provider is
                                deprecated
    - Resolves: upstream#3827 - SSSD should log to syslog if a domain is not
                                started due to a misconfiguration
    - Resolves: upstream#3830 - Printing incorrect information about domain with
                                sssctl utility
    - Resolves: upstream#3489 - p11_child should work wit openssl1.0+
    - Resolves: upstream#3750 - [RFE] man 5 sssd-files should mention necessary
                                changes in nsswitch.conf
    - Resovles: upstream#3650 - RFE: Require smartcard authentication
    - Resolves: upstream#3334 - sssctl config-check does not check any special
                                characters in domain name of domain section
    - Resolves: upstream#3849 - Files: The files provider always enumerates
                                which causes duplicate when running getent passwd
    - Related: upstream#3855 - session not recording for local user when groups
                               defined
    - Resolves: upstream#3802 - Reuse sysdb_error_to_errno() outside sysdb
    - Related: upstream#3493 - Remove the pysss.local interface