Do not update pip on Travis and CircleCI

.circleci/install_dependencies.sh

@@ -73,7 +73,6 @@ if [ -z \"\${PYENV_LOADING}\" ]; then
   unset PYENV_LOADING
 fi" >> $BASH_ENV
 
-pip install -U pip wheel setuptools
 pip install -r python/test_requirements.txt
 
 set +e

ci/travis/travis_install.sh

@@ -63,7 +63,6 @@ python_version=$(python -c 'import sys; print( "{0}.{1}".format( sys.version_inf
 echo "Checking python version (actual ${python_version} vs expected ${YCM_PYTHON_VERSION})"
 test ${python_version} == ${YCM_PYTHON_VERSION}
 
-pip install -U pip wheel setuptools
 pip install -r python/test_requirements.txt
 
 # The build infrastructure prints a lot of spam after this script runs, so make