Difficult to edit/cancel reservation

[William-Le88]

Tensorhive version: 0.3.6

Issue: Difficult to edit / cancel reservation

Description: creating the reservation for one node with 4 GPU card with start date/end date, start time/end time.
When we want to edit/cancel the reservation schedule for that node, we have to edit/cancel the reservation one by one for each GPU card which is considered tedious work.

Proposed: It would be better if it is possible to have option for user to edit/cancel the reservation on GPU server as the whole.