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: I6e015c2e0a28f9b990bfd7b84a2317d339abbb4e
Closes-bug: #1815243
Partial-bug: #1815231

hooks/install

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/bash -e
 # ensure that the python3 bits are installed, whichever version of ubunut
 # is being installed.
 

hooks/install_deps

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/bash -e
 # Wrapper to ensure that python dependencies are installed before we get into
 # the python part of the hook execution
 

hooks/upgrade-charm

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/bash -e
 # Wrapper to ensure that old python bytecode isn't hanging around
 # after we upgrade the charm with newer libraries
 rm -rf **/*.pyc