[CI] Packgaing tests failing while building rhel-8 box

[bizybot]

I see failed packaging tests job:-
https://elasticsearch-ci.elastic.co/job/elastic+elasticsearch+7.0+packaging-tests/372/console
https://elasticsearch-ci.elastic.co/job/elastic+elasticsearch+7.x+packaging-tests/346/console
https://elasticsearch-ci.elastic.co/job/elastic+elasticsearch+7.x+packaging-tests/345/console

15:04:14     rhel-8: Red Hat Enterprise Linux 8 for x86_64 - BaseOS  171  B/s | 512  B     00:02    
15:04:14     rhel-8: No match for argument: rsync
15:04:14     rhel-8: Error: Unable to find a match
15:04:14 
15:04:14 Standard error:
15:04:14 The SSH command responded with a non-zero exit status. Vagrant
15:04:14 assumes that this means the command failed. The output for this command
15:04:14 should be in the log above. Please read the output to determine what
15:04:14 went wrong.
15:04:14 
15:04:14 
15:04:14 > Task :qa:vagrant:vagrantRhel8#up FAILED

[elasticmachine]

Pinging @elastic/es-core-infra

[rjernst]

This was fixed in #41924, but I had not realized rhel8 had been backported. I've disabled in for 7.0, 7.1 and 7.x now.