Merge branch 'stable-2.13' into stable-2.14

Merge branch 'stable-2.13' into stable-2.14

* stable-2.13
  (no changes)

* stable-2.12
  Accept allocation of 0 jobs
  Return multiple fields multiple times
  In queries collect all needed data
  Add a function computing the filter arguments
  Utils: Add ordNub
  Accept timeout errors are luxi down
  Correct indendation
  In confd provide proper serial number

* stable-2.11
  (no changes)

* stable-2.10
  Add a new unit test for LUInstanceMultiAlloc
  Fix a bug in LUInstanceMultiAlloc LU

Signed-off-by: Petr Pudlak <pudlak@google.com>
Reviewed-by: Klaus Aehlig <aehlig@google.com>