A.139. Release 3.5.28

Pgpool-II doesn't support GSSAPI. Allow Pgpool-II to deal with GSSAPI encrypted connection request from frontend instead of responding with an error. (Tatsuo Ishii)

Patch is created by me, reviewed and tested by Umar Hayat.

Fix query rewrite syntax error of "INSERT ... ON CONFLICT" in native replication mode. (bug 654) (Bo Peng)

Fix connection counter was not counted down when query is canceled. (bug 656) (Tatsuo Ishii)

Fix pgpool_setup bugs while checking the version of PostgreSQL. (Bo Peng)