[raster]: raster_columns should support foreign tables and materialized views

[robe]

I haven't tested this, but looking at the raster_columns view it looks like it's missing relkind for materialized views and foreign tables similar to issue in #2511

should be changed to

c.relkind = 'r'::"char" OR c.relkind = 'v'::"char" OR c.relkind = 'm'::"char" OR c.relkind = 'f'::"char"

unfortunately foreign tables and materialized views never have constraints so the ability to get the other relevant info will be limited non-existent.

I wouldn't bother pushing to 2.0 since I think the user base of people that would try to use a PostgreSQL FDW in 9.2 and using raster and caring about raster_columns is really small if existent at all.

[dustymugs]

Fixed in trunk as of r12051. Fixed for 2.1 as of r12052