experiment w/ docs formatter on SQLA 1.4

experiment w/ docs formatter on SQLA 1.4

Enhanced the "{sql}" thing some more so that it maintains
these tags exactly as they were.

Note that the "{sql}" and "{stop}" tags are intended
to be on the Python code lines, not the SQL lines, so special
handling to find these, preserve them, then add them back
after python code is formatted is added here.

Change-Id: I07acd3ea54608cd63bee8003679f8dff131a90f4