Обсуждение: pgsql: Fix up closePGconn() so that PQreset() will work on GSSAPI/SSPI

Log Message:
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Fix up closePGconn() so that PQreset() will work on GSSAPI/SSPI connections;
the patch for those features put its cleanup code into freePGconn() which is
really the wrong place.  Remove redundant code from freePGconn() and add
comments in hopes of preventing similar mistakes in future.
Noticed while trying (futilely) to reproduce bug #3902.

Modified Files:
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    pgsql/src/interfaces/libpq:
        fe-connect.c (r1.355 -> r1.356)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/libpq/fe-connect.c?r1=1.355&r2=1.356)