add RWF_(D)SYNC flag to preadv2/pwritev2 V2

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Add per-I/O sync flags, which are very useful for all kinds of file servers
or storage targets.  To properly do this refactor lots of direct I/O code
to not pass pointless argument, which makes the whole series a net negative
in terms of lines of code.

Changes since V1:
 - fix RWF_SYNC defintion
 - fix a comment

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