Updated unit tests to use ConfigOverrider
Updated unit tests to use ConfigOverrider

pombredanne/grr,darrenbilby/grr,google/grr,destijl/grr,pombredanne/grr,pidydx/grr,ahojjati/grr,pombredanne/grr,dunkhong/grr,pidydx/grr,ahojjati/grr,dunkhong/grr,dunkhong/grr,pombredanne/grr,statik/grr,statik/grr,dunkhong/grr,shifter/grr,shifter/grr,ahojjati/grr,statik/grr,destijl/grr,destijl/grr,statik/grr,ahojjati/grr,ahojjati/grr,destijl/grr,pchaigno/grr,statik/grr,dunkhong/grr,shifter/grr,pombredanne/grr,statik/grr,shifter/grr,darrenbilby/grr,pchaigno/grr,ahojjati/grr,google/grr,pchaigno/grr,pidydx/grr,pombredanne/grr,google/grr,destijl/grr,pidydx/grr,google/grr,ahojjati/grr,shifter/grr,destijl/grr,google/grr,darrenbilby/grr,pidydx/grr,statik/grr,darrenbilby/grr,shifter/grr,darrenbilby/grr,pombredanne/grr,pidydx/grr,dunkhong/grr,google/grr,destijl/grr,pchaigno/grr,shifter/grr,pchaigno/grr,dunkhong/grr,pchaigno/grr,google/grr,darrenbilby/grr,darrenbilby/grr,pidydx/grr,pchaigno/grr