Add very basic support for email header, footer

- Add EMAIL_HEADER, EMAIL_FOOTER conf file options
- Add example conf file to illustrate currently supported
  options. Future supported options should be added to
  the file to showcase their use.

refs WhyAskWhy#5

email_updates.conf.example

@@ -0,0 +1,10 @@
+
+# Example include file for the email_updates.sh script
+
+DEBUG_ON=0
+EMAIL_TAG_PROJECT="servers-general"
+EMAIL_TAG_CATEGORY="OS Patches"
+EMAIL_DEST="[email protected]"
+
+EMAIL_HEADER="The following updates are available for installation:"
+EMAIL_FOOTER="{{include(docs:How_to_apply_patches_to_our_systems)}}"

email_updates.sh

@@ -365,6 +365,9 @@ email_report() {
     NUMBER_OF_UPDATES="${#updates[@]}"
     EMAIL_SUBJECT="${HOSTNAME}: ${NUMBER_OF_UPDATES} update(s) are available"
 
+    # TODO: Add guard for this variable not existing (new feature as of v0.3)
+    echo -e "${EMAIL_HEADER}\n" >> ${TEMP_FILE}
+
     # Write updates to the temp file
     for update in "${updates[@]}"
     do
@@ -389,6 +392,9 @@ email_report() {
 
     fi
 
+    # TODO: Add guard for this variable not existing (new feature as of v0.3)
+    echo -e "\n${EMAIL_FOOTER}\n" >> ${TEMP_FILE}
+
     # Send the report via email
     # If user chose to masquerade this email as a specific user, set the value
     if [[ ! -z ${EMAIL_SENDER} ]]; then