Added temporary workaround for CentOS 7 os-release id bug. #31539
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What does this PR do?
Use /etc/centos-release file to get the os release number instead of /etc/os-release if the os is CentOS 7. This is done because CentOS 7 lacks minor release id number in the os-release file that is a known opened but https://bugs.centos.org/view.php?id=8359
What issues does this PR fix or reference?
Fixes: #31365
Previous Behavior
Set grains release id to 7
New Behavior
Set grains release id to 7.2.1511 (in my case)
Tests written?