io_tester: implement unlinking via blocks discarding #2141
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This change is intended to implement a possibility
to select the implementation of unlink operation
used by unlink_request_type.
A new YAML parameter called 'unlink_type' is now
available to the users. Two following values are supported:
a) ordinary - uses unlink() to remove a file
b) blocks_discarding - opens a file, unlinks it, then
issues trim request for each block
according to RPS parameter. In the
end closes the file.
It will be used to conduct measurements related to
impact of unlinking on read and write operations.