[No Story] Correct handling of VIRTUAL_ENV variable

Change-Id: I6a9a3f7413ce37be1547a2c1b5ad95e7cbb5bb7a

run_tests.sh

@@ -2,6 +2,8 @@
 # This script is designed for local usage.
 
 # Code coverage does not seem work without /nfs4 or /gpfs access
+export VIRTUAL_ENV=$NRP_VIRTUAL_ENV
+
 make test-nocover
 RET=$?
 

verify.sh

@@ -3,6 +3,7 @@
 
 # Ignore generated files.
 export IGNORE_LINT="platform_venv"
+export VIRTUAL_ENV=$NRP_VIRTUAL_ENV
 
 # This script only runs static code analysis, the tests can be run separately using run_tests.sh
 make run_pep8 run_pylint