Add immutability to PVC subrole

1. Remove the obsolete pvc-vacuum script install.

2. Remove notifies when modifying configs; we do not want to restart the
daemons uncontrolled.

3. Add bootstrap check to package installs so they only happen on
bootstrap.

This ensures this part of the role, on re-runs, will *only* update
configs and not actually touch the running daemon. This makes it safe to
run before a oneshot/update-pvc-daemons.yml playbook run.

roles/pvc/templates/pvc/pvc-vacuum.j2

@@ -1,31 +0,0 @@
-#!/bin/bash
-# Daily vaccuum script for PVC daemons
-# {{ ansible_managed }}
-
-# This script cleans up the PostgreSQL databases as well as the Zookeeper
-# database. This prevents filesystem growth balooning after loong running
-# periods.
-
-echo -e "----------------------------"              &>>/var/log/pvc/vacuum.log
-echo -e "$( date )"                                 &>>/var/log/pvc/vacuum.log
-echo -e "----------------------------"              &>>/var/log/pvc/vacuum.log
-
-#
-# PostgreSQL
-#
-
-# Don't run if we aren't the Patroni primary
-HOSTNAME="$( hostname -s )"
-PRIMARY="$( patronictl -c /etc/patroni/config.yml -d zookeeper://localhost:2181 list --format json \
-              | jq -r '.[] | select(.Role == "Leader") | .Member' )"
-if [[ $HOSTNAME == $PRIMARY ]]; then
-    # Analyze the database
-    su postgres -c 'vacuumdb --verbose --analyze --all' &>>/var/log/pvc/vacuum.log
-fi
-
-#
-# Zookeeper
-#
-
-export ZOOCFG=/etc/zookeeper/conf/zoo.cfg
-/usr/share/zookeeper/bin/zkCleanup.sh -n 7          &>>/var/log/pvc/vacuum.log