List all the request items when the list is over osapi_max_limit

Convert the function _list into a loop function, which can retrieve
the items from the next link till the limit or the end of items has
been reached. This works for v2 only.

So far, only volume list in v2 support limit. The limit parameter
work for volume list in v2 only, but other list can extend it in
future work.

Change-Id: I011f0ed1a4ab639f67db6cae580d978c0b44c1bb
closes-bug: #1342192
Merge "List all the request items when the list is over osapi_max_limit"