Updated `module/unit': cleaned up scaffolding code
... share/unit/tests/dns-static.sh
Updated `module/remote': cleanup, simplification

Updated (mostly simplified) the code based on the new `dns' module.

Removed the cfrun function which was out-of-place, and moved some
general ssh options to the top of the file.

Added missing dependency on the `vault' module.
Added `module/remote' unit tests: issue 13
Updated `README.md'
... share/unit/tests/remote-static.sh