the pagination feature is broken at rbd status page

[ywang]

if there are hundreds of rbd volumes, the expandable table will make the ui awful

[Boxiang Zhu]

#500
Now I add the pagination setting on User Setting page. You can change the items per page.
At present, there is pagination on rbd status page.

[Boxiang Zhu]

#506
change the pagination from user page to setting page

[Boxiang Zhu]

#507
lack of comma cause the UI error