BugFix: Fix to pod filename ext and prox path

BugFix: Fix to pod filename ext and prox path

As per defect:
- the "context:" stanza of every tc_prox_baremetal*.yaml"
 file has an incorrect pathname for the config file

-  tc_prox_baremetal_binsearch.yaml and
tc_prox_baremetal_ramp.yaml refer to
"prox-baremetal.yml", which idoes not exist

- incorrect prox bin path

Resolution:
- Unify the pod file name and path for all BM tests
- Prox bin path changed to "/opt/nsb_bin/prox"

Change-Id: I16b25189104ad5585ddc1c2c0dd71b3c4c2aecd3
Signed-off-by: Abhijit Sinha <abhijit.sinha@intel.com>