Remove bundle specific stuff from test_tbb sub
Remove bundle specific stuff from test_tbb sub

Move browser bundle specific stuff to pre_test and post_test sub. This
should make it possible to replace them, and reuse test_tbb sub for
testing of other things.

gunesacar/tor-browser-bundle-testsuite,gunesacar/tor-browser-bundle-testsuite,boklm/tbb-testsuite,boklm/tbb-testsuite,boklm/tbb-testsuite,boklm/tbb-testsuite,gunesacar/tor-browser-bundle-testsuite,gunesacar/tor-browser-bundle-testsuite,boklm/tbb-testsuite