ProcStats : Use mutex lock to make fetch() thread safe.

Whilst investigating a possible memory issue using the Memory Auditor, I discovered the information printed was garbled if multiple threads where used.

The issue was the ProcStats::fetch method which was not thread safe. This MR fixes that with a simple mutex lock.

I also did a drive-by cleanup and code modernisation.

FYI @clemenci

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• 019a5b45 - ProcStats : Use mutex lock to make fetch() thread safe.
• e2d6fcc7 - MemoryAuditor : Only print memory stats if vsize>0

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• adff269d - ProcStats : Use mutex lock to make fetch() thread safe.
• 90b30380 - MemoryAuditor : Only print memory stats if vsize>0

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• 924744e4 - ProcStats: remove data members that do not need caching

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• e5299b79 - ProcStats: remove data members that do not need caching

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• 6118e38b - ProcStats: remove data members that do not need caching

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• b1c1a756 - ProcStats: simplify ProcStats::instance()

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• e321a6ae - ProcStats: Always use lock in fetch(...) as state is always updated

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resolved all threads

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• 26890325 - ProcStats: Attempt to reconnection to process proc stat when information appeats corrupted

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• 8c0ae0cc - ProcStats: Attempt to reconnection to process proc stat when information appeats corrupted

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• a018d4bb - ProcStats: Attempt to reconnection to process proc stat when information appeats corrupted

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• 9929a45a - ProcStats: default init members of linux_proc struct

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• 0866141a - ProcStats: default init members of linux_proc struct

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assigned to @clemenci