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Description of problem:

IPA provides two RPC protocols: XML-RPC and JSON.

With 8.4.0 the only IPA-provided tool, ipa-join, will use the XML-RPC service.

It has had the capability to use JSON since the upstream 4.9.0 release and has been in use in Fedora with no issues for half a year.

To enable JSON we need to replace 

%bcond_without ipa_join_xml

with

%bcond_with ipa_join_xml

We should also be able to drop the build and runtime dependency on xmlrpc-c.

This will not change the RPC protocols available to the server. It will only affect the protocols we utilize internally.

In RHEL8.4 it 
Requires:
libxmlrpc.so.3()(64bit)
libxmlrpc_client.so.3()(64bit)
libxmlrpc_util.so.4()(64bit)

In RHEL8.5 with
ipa-client-4.9.5-1.module+el8.5.0+11411+d272e903.x86_64.rpm
Dependency of libxmlrpc is removed.

In RHEL8.4 
ipa-client-4.9.2-4.module+el8.4.0+11156+94d209c1.x86_64.rpm
Requires: 
libxmlrpc.so.3()(64bit)
libxmlrpc_client.so.3()(64bit)
libxmlrpc_util.so.4()(64bit)
xmlrpc-c >= 1.27.4

In RHEL8.5
ipa-client-4.9.5-1.module+el8.5.0+11411+d272e903.x86_64.rpm
Dependency is removed. 
Based on this marking 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 (ipa 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/RHBA-2021:4230