reindexdb: Change quoting rule of --schema?

Hi all,
(Original author and Alvaro in CC, for comments)

reindexdb --schema has the idea of not quoting the schema given in
input of the command line. For example, if a schema uses upper-case
characters, the command could fail. Perhaps a fmtIdEnc() should be
applied, in the same fashion as --tablespace? This point has come
from Alvaro, during a recent review for a separate patch.

Here is the suggested change:
case REINDEX_SCHEMA:
- appendPQExpBufferStr(sql, name);
+ appendPQExpBufferStr(sql, fmtIdEnc(name, PQclientEncoding(conn)));

There may be a point in treating that as a bug, but that's also a
backward-incompatible change so perhaps that could just be left as-is.
The new quoting behavior feels upgraded to me, though, but perhaps I'm
just biased.

Comments and/or opinions are welcome.
Thanks,
--
Michael