Introduce macros determining if a replication slot is physical or logical.

Andres Freund <andres@anarazel.de>

Commit: 093d0c83c1d210167d122da92459a0677e04ffc9
Author: Andres Freund <andres@anarazel.de>
Date: 2015-08-11T10:32:48Z
Releases: 9.6.0
Introduce macros determining if a replication slot is physical or logical.

These make the code a bit easier to read, and make it easier to add a
more explicit notion of a slot's type at some point in the future.

Author: Gurjeet Singh
Discussion: CABwTF4Wh_dBCzTU=49pFXR6coR4NW1ynb+vBqT+Po=7fuq5iCw@mail.gmail.com

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