OL7: invalid link in the PCI-DSS table

#### Description of problem:

The linkchecker test uncovers a URL which returns 404.

#### SCAP Security Guide Version:

stabilization as of fd0ddbaf67dc4c2a5fc466982b5741d11ea8441c

#### Operating System Version:

tests run on Fedora

#### Steps to Reproduce:

1. ./build_product ol7
2. cd build
3. ctest -R '.*link.*'

#### Actual Results:

Results will show following error:

```
URL `https://docs.oracle.com/en/operating-systems/oracle-linux/7/network/ol7-nettime.html'
Name `https://docs.oracle.com/en/operating-systems/oracle-linux/7/network/ol7-nettime.html'
Parent URL file:///home/vojta/repos/upstream/content/build/tables/table-ol7-pcidssrefs.html, line 4007, col 5
Real URL https://docs.oracle.com/en/operating-systems/oracle-linux/7/network/ol7-nettime.html
Check time 2.650 seconds
Size 14.76KB
Result Error: 404 Not Found
```

#### Expected Results:

Passing test.

#### Additional Information/Debugging Steps: