RFE: detect filesystem capabilities before starting a transaction

[pmatilai]

Not all filesystems support everything rpm does, and sometimes features are intentionally disabled by mount options. Currently these are failing in the middle of the transaction with varying degrees of collateral damage. Rpm should probe filesystems at the preparing stage to check if they support the necessary features and abort early with problems raised if necessary. The filesystem features to probe (if needed by the installing set) includes at least:

• capabilities
• SELinux
• executable/suid bits
• device nodes
• ...

[cgwalters]

xref containers/storage#1608