Convert thirdparty and stress tests to use global CONF object

This commit takes all the uses of config in the thirdparty and stress
tests and converts them to use the global CONF object.

Partially implements bp config-cleanup

Change-Id: I683577f133643f6159dbfe7295911d155b613f92
Convert scenario tests to use global CONF object

This commit takes all the uses of config in the scenario tests and
converts them to use the global CONF object.

Partially implements bp config-cleanup

Change-Id: I1bac686587f1705901b653b07300077623ba9f21
Merge "Convert thirdparty and stress tests to use global CONF object"
Merge "Convert scenario tests to use global CONF object"