Add support for socket:// in NUTS marry function.

[gdamore]

This also adds a HUGE test for REP using socket so that we can discriminate failures that might exist using sockets instead of inproc.

fixes #

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (ee697a2) 79.14% compared to head (b4512a2) 79.24%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1774 +/- ## ========================================== + Coverage 79.14% 79.24% +0.09% ========================================== Files 94 94 Lines 21077 21077 ========================================== + Hits 16681 16702 +21 + Misses 4396 4375 -21 ```

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