Bucket capabilities not refreshed when refreshing.

When a bucket is first loaded, its Capabilities member is populated.  This isn't then updated when refreshing.  Prior to 7.6 and the automated migration this wasn't an issue since changes wouldn't trigger a refresh.  In 7.6 if a bucket is first loaded without advertising the querySystemCollection capability and later does, the streaming monitor will force a refresh but the loaded bucket will never change so it will constantly be refreshed.

(A workaround is to just restart the affected Query nodes - the buckets on reload should advertise the capability up front.)

This bug is to include updating the capabilities when refreshing a bucket.