Fixes #15454: Fixes to allow building the agent on Fedora 30

[amousset]

https://issues.rudder.io/issues/15454

[Normation-Quality-Assistant]

This PR breaks qa-test

-- stdout -- 
Branch 'branches/rudder/5.0' set up to track remote branch 'branches/rudder/5.0' from 'NRM'.
Your branch is up to date with 'NRM/branches/rudder/5.0'.
Already up to date.
Already up to date.
[...]
 * [new branch]        bug_15454/fixes_to_allow_building_the_agent_on_fedora_30 -> bug_15454/fixes_to_allow_building_the_agent_on_fedora_30_pr
From github.com:Normation/rudder-packages
   a7ca148e..a8b02d03  branches/rudder/5.0 -> NRM/branches/rudder/5.0
   1cc34b93..be00eebb  master              -> NRM/master
Switched to branch 'branches/rudder/5.0'
Switched to a new branch '5.0_test'
+ find ./rudder-server-relay/SOURCES/relay-api/relay_api -name '*.py'
+ xargs pylint -E --disable=C,R,no-member,no-name-in-module --persistent=n
No config file found, using default configuration

You should run ./qa-test in your repository to make sure it works.
You can also run rudder-dev merge https://github.com/Normation/rudder-packages/pull/2025 --test to test with upmerging.
After this, you can remove the qa: Can't merge ta
-- Your faithful QA (https://ci.normation.com/jenkins/job/merge-accepted-pr/13571/console)

[amousset]

OK, merging this PR

[amousset]

PR updated with a new commit

[Normation-Quality-Assistant]

This PR is not mergeable to upper versions.
Since it is "Ready for merge" you must merge it by yourself using the following command:
rudder-dev merge https://github.com/Normation/rudder-packages/pull/2025
-- Your faithful QA
Kant merge: "In law a man is guilty when he violates the rights of others. In ethics he is guilty if he only thinks of doing so."
(https://ci.normation.com/jenkins/job/merge-accepted-pr/13573/console)

[amousset]

PR updated with a new commit

[amousset]

OK, squash merging this PR

[Normation-Quality-Assistant]

This PR is not mergeable to upper versions.
Since it is "Ready for merge" you must merge it by yourself using the following command:
rudder-dev merge https://github.com/Normation/rudder-packages/pull/2025
-- Your faithful QA
Kant merge: "To be is to do."
(https://ci.normation.com/jenkins/job/merge-accepted-pr/13575/console)