Move regression test listing of builtin leakproof functions to opr_sanity.sql.

Andres Freund <andres@anarazel.de>

Commit: e0cb4aa89dd61cb1a76d348ced634681255b6a07
Author: Andres Freund <andres@anarazel.de>
Date: 2014-06-05T11:54:25Z
Releases: 9.4.0
Move regression test listing of builtin leakproof functions to opr_sanity.sql.

The original location in create_function_3.sql didn't invite the close
structinity warranted for adding new leakproof functions. Add comments
to the test explaining that functions should only be added after
careful consideration and understanding what a leakproof function is.

Per complaint from Tom Lane after 5eebb8d954ad.

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