pgsql: When logging the recovery.conf parameters, show them quoted as

Log Message:
-----------
When logging the recovery.conf parameters, show them quoted as they would
appear in the configuration file.

Modified Files:
--------------
pgsql/src/backend/access/transam:
xlog.c (r1.288 -> r1.289)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/access/transam/xlog.c?r1=1.288&r2=1.289)