kernel: don't reuse VfsReq allocations for a single process

To use the same testing methodology as when I've introduced request slots:
	before:
	/ $ iostress 1 1000000 0 > /dev/vtty
	run 0: 2585203
	1000000 calls, 0 bytes. avg 2585203
	after:
	/ $ iostress 1 1000000 0 > /dev/vtty
	run 0: 2783171
	1000000 calls, 0 bytes. avg 2783171
This is around a 7.7% slowdown - that I hope to fix with a better malloc.

While this doesn't really make the code that much simpler, it doesn't feel
like the right approach in the first place

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