sanitycheck: allow for more expressive filtering in testcase.ini

The old 'config_whitelist' directive in testcase.ini has been removed.
We use the new expr_parser module to parse a 'filter' directive which
is a boolean expression. This gives a great deal more flexibility
in how tests can be filtered.

To keep the tree bisectable, use of config_whitelist in testcase.ini
converted to the new expression language.

Change-Id: I0617319818c5559c0f0569d2fa73d09b681cac51
Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>