gvirstor: Modernize the I/O pathHEADmain

 - Add unmapped I/O support.  The only case when the code needs data
access is BIO_READ returning zeroes for unallocated space.
 - Add BIO_FLUSH support.  Just send it to all allocated components.
 - Add BIO_DELETE support.  While current design does not allow
freeing allocated blocks, at least pass it to underlying providers.
 - Add direct I/O completion support.
 - Add rotation rate reporting.
 - Fix few minor issues.

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