Add refresh flag to force refresh of the Registry state

[f-f]

Fix #1320

[thomashoneyman]

I think getMetadataForPackagesImpl needs this too, or else --refresh won't affect metadata looksup from the db cache.

  getMetadataForPackagesImpl :: Db -> OnlineStatus -> Array PackageName -> Spago (LogEnv ()) (Either String (Map PackageName Metadata))
  getMetadataForPackagesImpl db onlineStatus names = do
- (map Map.fromFoldable <<< sequence) <$> case onlineStatus == OnlineBypassCache of
+ (map Map.fromFoldable <<< sequence) <$> case onlineStatus == OnlineBypassCache || onlineStatus == OnlineRefreshRegistry of

[f-f]

Ha, great catch! I have added the fix and extended the new test to cover this case