Presets: update Costco, Sam's Club to shop=warehouse

[HubMiner]

No description provided.

[bhousel]

Thanks for the PR, but this change needs to be made in the name-suggestion-index project. That is iD's source for the presets for chain stores.

I'd also drop the building and access tags for these. access=customers is implied, or more for parking lots. building really depends on whether a mapper wants to map it as a building or not (and I'd consider it more building=retail than building=commercial anyway).

[1ec5]

By the way, shop=warehouse appears to be little used at this point. Most Costco and Sam’s Club locations have been mapped as shop=wholesale or shop=department_store. (This PR uses shop=wholesale, but the title and commit message are a bit misleading.)

[HubMiner]

shop=warehouse : good catch, typo in subject.

[HubMiner]

I was hoping to keep building=retail, to normalize future values, but I will defer to my seniors... :)

Another topic, I am proposing to update name:

1. Correct name is "Costco Wholesale",
2. Any objections?