joid: Switch using labels instead of slaves

joid: Switch using labels instead of slaves

This change switches joid jobs to use labels instead of tying
jobs to slaves.

The changes in detail are:
- Joid jobs can roam on any pod that is labelled with joid-baremetal
  and joid-virtual.
- Above means that there is no branch/pod allocation anymore.
- New jobs are created in order to get rid of pod names from them and
  just use baremetal or virtual in names.
- Old jobs are removed.
- Related test jobs are updated.
- POD specific parameters are updated and instead of adding pod
  specific parameters, they now become parameters for all the pods
  labelled with same label. It is not a problem at the moment as
  both Intel PODs (pod5, pod6) have same parameters but a different
  pod with different parameters will require alignment between pods.

Job structure remains same; one parent job calling 3 downstream jobs:
deploy, functest, yardstick.

Change-Id: I30d270cd05ba3756f6f161d65ee5160eab6b80f4
Signed-off-by: Fatih Degirmenci <fatih.degirmenci@ericsson.com>