move setting up venv back out of script so it's not run with sudo

tests/letstest/scripts/bootstrap_os_packages.sh

@@ -192,6 +192,3 @@ elif [ -f /etc/redhat-release ]; then
 fi
 
 Bootstrap
-
-cd $1 # REPO_ROOT
-$2 # Call the venv setup script here so we don't have to activate Python36SCL in the parent

tests/letstest/scripts/test_apache2.sh

@@ -40,11 +40,19 @@ fi
 cd letsencrypt
 
 echo "Bootstrapping dependencies..."
-sudo tests/letstest/scripts/bootstrap_os_packages.sh . "tools/venv3.py -e acme[dev] -e certbot[dev,docs] -e certbot-apache"
+sudo tests/letstest/scripts/bootstrap_os_packages.sh
 if [ $? -ne 0 ] ; then
     exit 1
 fi
 
+if command -v python && [ $(python -V 2>&1 | cut -d" " -f 2 | cut -d. -f1,2 | sed 's/\.//') -eq 26 ]; then
+  # RHEL/CentOS 6 will need a special treatment, so we need to detect that environment
+  # Enable the SCL Python 3.6 installed by letsencrypt-auto bootstrap
+  PATH="/opt/rh/rh-python36/root/usr/bin:$PATH"
+fi
+
+tools/venv3.py -e acme[dev] -e certbot[dev,docs] -e certbot-apache
+
 sudo "venv3/bin/certbot" -v --debug --text --agree-tos \
                    --renew-by-default --redirect --register-unsafely-without-email \
                    --domain $PUBLIC_HOSTNAME --server $BOULDER_URL