Update travis configuration

don't use "sudo pip install" in travis.yml

.travis.yml

@@ -22,7 +22,7 @@ install:
   - git clone https://github.com/OCA/maintainer-quality-tools.git ${HOME}/maintainer-quality-tools
   - export PATH=${HOME}/maintainer-quality-tools/travis:${PATH}
   - travis_install_nightly
-  - sudo pip install python-ldap
+  - pip install python-ldap
   - printf '[options]\n\nrunning_env = dev' > ${HOME}/.openerp_serverrc
   - ln -s server_environment_files_sample ./server_environment_files
 script: