Fix py3 travis tests

Author: Dan

.travis.yml

@@ -12,7 +12,7 @@ install:
 script:
   - python setup.py nosetests --with-coverage --cover-package=pssh
   # If using py3, run 2to3 on embedded server and tests and run nosetests for new test dir
-  - python -c 'import sys; sys.version_info.major==3 and sys.exit(1)' || 2to3 -nw embedded_server/*.py && 2to3 tests/*.py -o tests3 -nw && cp tests/test_client_private_key tests3/ && python setup.py nosetests -w tests3 --with-coverage --cover-package=pssh
+  - python -c 'import sys; sys.version_info.major==3 and sys.exit(1)' || eval "2to3 -nw embedded_server/*.py && 2to3 tests/*.py -o tests3 -nw && cp tests/test_client_private_key tests3/ && python setup.py nosetests -w tests3 --with-coverage --cover-package=pssh"
 notifications:
   email:
     on_failure: change