Bug 1318295 - Vagrant: Move libmysqlclient install to shell provisioner

The vendor script outputs its own status message, so none required in
`vagrant/setup.sh`.

puppet/manifests/classes/python.pp

@@ -1,10 +1,5 @@
 class python {
 
-  exec {"vendor-libmysqlclient":
-    command => "${PROJ_DIR}/bin/vendor-libmysqlclient.sh ${VENV_DIR}",
-    user => "${APP_USER}",
-  }
-
   exec{"pip-install":
     require => [
       Exec['vendor-libmysqlclient'],

vagrant/setup.sh

@@ -8,6 +8,7 @@ SRC_DIR="$HOME/treeherder"
 VENV_DIR="$HOME/venv"
 ELASTICSEARCH_VERSION="2.3.5"
 
+export PATH="$VENV_DIR/bin:$PATH"
 # Suppress prompts during apt-get invocations.
 export DEBIAN_FRONTEND=noninteractive
 
@@ -87,6 +88,8 @@ if [[ ! -d "$VENV_DIR" ]]; then
     virtualenv "$VENV_DIR"
 fi
 
+./bin/vendor-libmysqlclient.sh "$VENV_DIR"
+
 echo '-----> Initialising MySQL database'
 # The default `root@localhost` grant only allows loopback interface connections.
 mysql -u root -e 'GRANT ALL PRIVILEGES ON *.* to root@"%"'