[Blueprint servercloud-p-arm-openmpi] Update OpenMPI to the 1.5 version with ARM support

[Robie Basak]

Blueprint changed by Robie Basak:

Whiteboard changed:
   Nothing to discuss, we just either update the existing one or add another package version into the archive. -robbie.w
  Added a bug task to track activity. -- Daviey
+ 
+ There seems to have been some rudimentary support for ARM added in the
+ past (https://bugs.launchpad.net/ubuntu/+source/openmpi/+bug/438433).
+ What exactly is the functionality/use case that we need to add, and how
+ would I verify that it is complete? --rbasak

-- 
Update OpenMPI to the 1.5 version with ARM support
https://blueprints.launchpad.net/ubuntu/+spec/servercloud-p-arm-openmpi