OCP4: 404 URL in BSI guide

[vojtapolasek]

Description of problem:

The linkchecker test uncovers a URL which returns 404.

SCAP Security Guide Version:

stabilization as of fd0ddba

Operating System Version:

tests run on Fedora

Steps to Reproduce:

1. ./build_product ocp4
2. cd build
3. ctest -R '.link.'

Actual Results:

Results will show following error:

URL        `https://docs.redhat.com/en/documentation/openshift_container_platform/4.17/html/networking/ovn-kubernetes-network-plugin#nw-egress-ips-about_configuring-egress-ips-ovn'
Name       `https://docs.redhat.com/en/documentation/openshift_container_platform/4.17/html/networking/ovn-kubernetes-network-plugin#nw-egress-ips-about_configuring-egress-ips-ovn'
Parent URL file:///home/vojta/repos/upstream/content/build/guides/ssg-ocp4-guide-bsi.html, line 1430, col 1
Real URL   https://docs.redhat.com/en/documentation/openshift_container_platform/4.17/html/networking/ovn-kubernetes-network-plugin#nw-egress-ips-about_configuring-egress-ips-ovn
Check time 0.449 seconds
Size       224.61KB
Result     Error: 404 Not Found

Expected Results:

Passing test.

Additional Information/Debugging Steps: