Api call show available storagerouters

[jeroenmaelbrancke]

If someone use the api for creating a vdisk.
How can they know if a storagerouter is down?
At this moment we don't have a call that tells us for vpool x give us all the available storagerouters where we can deploy a vdisk.

refence ticket: http://support.openvstorage.com/browse/OVSSUP-351

[JeffreyDevloo]

Could be done in conjunction with #1514

[sjovdnbos]

Fixed by:

#2280