Added config parameters for dump over network - v4
Added config parameters for dump over network - v4

Have used these parameters in dump over ssh and nfs in PowerNVDump.py.

Signed-off-by: Pavithra <5e92747f16472daf4dad218403a6b912fb375b79@linux.vnet.ibm.com>

open-power/op-test-framework,open-power/op-test-framework,open-power/op-test-framework