Commits on Oct 11, 2017

1. Fix erlang time module compatibility …

   `now/0` is deprecated since Erlang 18.0, and a set of new time related
   functions are available.
   
   Usually `now/0` can be replaced with `os:timestamp/0`, however in some
   instances it was used effectively to produce monotonically incrementing values
   rather than timestamps. So added a new `couch_util:unique_monotonic_integer/0`.
   
   Most functional changes are in couch_uuid module. There `now/0` was used both
   as a timestamp and for uniqueness. To emulate previous behavior, a local
   incrementing clock sequence is used. If `os:timestamp/0` does not advance since
   last call then the local clock is advanced by 1 microsecond and that's used to
   generate the next V1 UUIDs. As soon as os:timestamp/0` catches up, the local
   sequence reset to that latest value.
   
   Also exported function `utc_random/0` was not used, after updating the function
   it wasn't exported anymore.

   

   nickva committed Oct 11, 2017
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