Populate viperserv bin directory

Summary:
Wikidata access layer utilities (in rDWD) are called through
the get_external_script procedure, expecting the binary to be
in $HOME/bin directory. This change creates symlink for them.

Ref T1309.

Test Plan: Run create_surname

Reviewers: dereckson

Reviewed By: dereckson

Maniphest Tasks: T1309

Differential Revision: https://devcentral.nasqueron.org/D1215