use dune variants instead of functors (#526)
* remove time as functor argument
* no more random, clock, time as functors
* use a mtime.mock for the tcp-window test
* minor cleanups
* .
* rm
* require arp not being functorised over Time
* adapt to mirage-crypto-rng 1.2.0 API
9a59a7
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Feb 06 16:16 +00:00