fix travis script for running python tests

.travis.yml

@@ -120,12 +120,12 @@ script:
 
 # here we specify the temporary lib dir as a path to look for the main library
 # a binary built with sanitizer does not interact well with python
+  - cd bindings/python
   - 'if [[ $lang != "sanitizer" ]]; then
-    cd bindings/python;
     bjam --hash -j3 warnings-as-errors=on debug-iterators=on picker-debugging=on invariant-checks=full variant=$variant $coverage_toolset stage_module libtorrent-link=shared install-type=LIB dll-path=../../lib;
     LD_LIBRARY_PATH=../../lib DYLD_LIBRARY_PATH=../../lib python test.py;
-    cd ../..;
     fi'
+  - cd ../..
 
   - cd simulation
   - if [ $sim = "1" ]; then