Update pre-install hooks to fail on error

The pre-install operations may fail, yet that failure is not
elevated to the user. This masks the failure and makes early
package install issues difficult to troubleshoot.

If the basic pre-install script fails, the charm should not
proceed to later hooks as the requirements may not be met.

Hashbangs for bash should specify -e (errexit) on all of the
pre-install bash scripts.

Change-Id: Ie7b99dfa4cbe00a03acf1b2cc2eeecc7f84fbe17
Closes-bug: #1815243
Partial-bug: #1815231

hooks/install

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/bash -e
 # Wrapper to deal with newer Ubuntu versions that don't have py2 installed
 # by default.
 

hooks/install_deps

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/bash -e
 # Install required dependencies for charm runtime
 
 declare -a DEPS=('apt' 'netaddr' 'netifaces' 'yaml' 'jinja2' 'dnspython')

hooks/upgrade-charm

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/bash -e
 # Re-install dependencies to deal with py2->py3 switch for charm
 
 ./hooks/install_deps