Fix missing feature configfiles (#9324)

* Update configfile lines for renamed openhab-addons-external artifactId
* Add missing 2.5.x configfiles files which were never merged into the main branch
* Fix configfile lines not aggregated in feature.xml file

Fixes openhab/openhab-distro#1205

Signed-off-by: Wouter Born <github@maindrain.net>

features/openhab-addons-external/src/main/resources/conf/exec.whitelist

@@ -0,0 +1,2 @@
+# For security reasons all commands that are used by the exec binding or transformation need to be whitelisted.
+# Every command needs to be listed on a separate line below.

features/openhab-addons-external/src/main/resources/conf/openhabcloud.cfg

@@ -0,0 +1,19 @@
+############################## openHAB Cloud Connector #############################
+
+# The URL of the openHAB Cloud service to connect to.
+# Optional, default is set to the service offered by the openHAB Foundation
+# (https://myopenhab.org/)
+#baseURL=
+
+# Defines the mode in which you want to operate the connector.
+# Possible values are:
+# - notification: Only push notifications are enabled, no remote access is allowed.
+# - remote: Push notifications and remote access are enabled.
+# Optional, default is 'remote'.
+#mode=
+
+# A comma-separated list of items to be exposed to external services like IFTTT.
+# Events of those items are pushed to the openHAB Cloud and commands received for
+# these items from the openHAB Cloud service are accepted and sent to the local bus.
+# Optional, default is an empty list.
+#expose=

features/openhab-addons-external/src/main/resources/conf/voicerss.cfg

@@ -0,0 +1,5 @@
+######################## VoiceRSS Text-to-Speech Engine ########################
+
+# API key you got when you subscribed to the Voice RSS service
+# Open your profile to get the value: http://www.voicerss.org/personel/
+#apiKey=1234567890