add python 2.7.14 bin path to /etc/environment file
add python 2.7.14 bin path to /etc/environment file

This is required following the installation of python 2.7.14 in #11123

alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet