Vagrant / Fix FWROOT for tfb command (#2537)

* quick vagrant fix

* fix tfb command on vagrant

deployment/vagrant-common/bootstrap.sh

@@ -90,7 +90,7 @@ if [ ! -e "~/.firstboot" ]; then
   #else
     # If there is no synced folder, clone the project
     export FWROOT="/home/vagrant/FrameworkBenchmarks"
-    echo FWROOT="/home/vagrant/FrameworkBenchmarks" >> ~/.bashrc
+    echo `export FWROOT="/home/vagrant/FrameworkBenchmarks"` >> ~/.bashrc
     echo "Cloning project from $GH_REPO $GH_BRANCH"
     git config --global core.autocrlf input
     git clone -b ${GH_BRANCH} https://github.com/${GH_REPO}.git $FWROOT