Change delimiter used for display of NextXID

Joe Conway <mail@joeconway.com>

Commit: 59a884e9854cb3cb7338394fb5f856209b040fb3
Author: Joe Conway <mail@joeconway.com>
Date: 2016-02-12T22:23:59Z
Releases: 9.6.0
Change delimiter used for display of NextXID

NextXID has been rendered in the form of a pg_lsn even though it
really is not. This can cause confusion, so change the format from
%u/%u to %u:%u, per discussion on hackers.

Complaint by me, patch by me and Bruce, reviewed by Michael Paquier
and Alvaro. Applied to HEAD only.

Author: Joe Conway, Bruce Momjian
Reviewed-by: Michael Paquier, Alvaro Herrera
Backpatch-through: master

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