[LU-15447] sanity-flr/208 fail on new kernels

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.16.0
• Affects Version/s: Upstream
• Severity: 3
• Epic Link: FLR tech debt review
• Assignee: Alex Zhuravlev
• Reporter: Alex Zhuravlev

Description

new kernel (e.g. 4.18.0-305.25.1) declares loopback devices in tmpfs as non-rotational, so Lustre re-export OSTs in tmpfs as non-rotational while sanity-flr/208 expect rotational by default.