This patch includes updated scripts to:
1.Select the host environment and test duration from host-config file
to execute the test cases based on the job type.
2.Remove code duplications like sourcing a file multiple times.
3.Make packet forwarding test cases execution look clear.
Change-Id: I88457b7f3dfacad1db2495090504974097228a4d
Signed-off-by: Gundarapu Kalyan Reddy <reddyx.gundarapu@intel.com>