include creds info for glacier and webdav

That and S3 are all that uses creds currently, except that external
remotes can use creds. I have not handled showing info about external
remote creds because they can have 0, 1, or more separate cred pairs, and
there's no way for info to enumerate them or know how they're used.
So it seems ok to leave out creds info for external remotes.

Remote/Glacier.hs

@@ -67,7 +67,8 @@ gen r u c gc = new <$> remoteCost gc veryExpensiveRemoteCost
 			availability = GloballyAvailable,
 			remotetype = remote,
 			mkUnavailable = return Nothing,
-			getInfo = return [("glacier vault", getVault c)]
+			getInfo = includeCredsInfo c (AWS.creds u) $
+				[ ("glacier vault", getVault c) ]
 		}
 	specialcfg = (specialRemoteCfg c)
 		-- Disabled until jobList gets support for chunks.

Remote/WebDAV.hs

@@ -72,7 +72,8 @@ gen r u c gc = new <$> remoteCost gc expensiveRemoteCost
 			availability = GloballyAvailable,
 			remotetype = remote,
 			mkUnavailable = gen r u (M.insert "url" "http://!dne!/" c) gc,
-			getInfo = return [("url", fromMaybe "unknown" (M.lookup "url" c))]
+			getInfo = includeCredsInfo c (davCreds u) $
+				[("url", fromMaybe "unknown" (M.lookup "url" c))]
 		}
 		chunkconfig = getChunkConfig c