handles spaces around hostname

((users doubleclick a host name and paste result in the installer)

debian/jitsi-meet-prosody.postinst

             db_input critical jitsi-videobridge/jvb-hostname || true
             db_go
         fi
-        JVB_HOSTNAME="$RET"
+        JVB_HOSTNAME=$(echo "$RET" | xargs echo -n)
 
         db_get jitsi-videobridge/jvbsecret
         if [ -z "$RET" ] ; then
 
         # detect dpkg-reconfigure, just delete old links
         db_get jitsi-meet-prosody/jvb-hostname
-        JVB_HOSTNAME_OLD=$RET
+        JVB_HOSTNAME_OLD=$(echo "$RET" | xargs echo -n)
         if [ -n "$RET" ] && [ ! "$JVB_HOSTNAME_OLD" = "$JVB_HOSTNAME" ] ; then
             rm -f /etc/prosody/conf.d/$JVB_HOSTNAME_OLD.cfg.lua
             rm -f /etc/prosody/certs/$JVB_HOSTNAME_OLD.key

debian/jitsi-meet-prosody.postrm

 
     purge)
         db_get jitsi-meet-prosody/jvb-hostname
-        JVB_HOSTNAME=$RET
+        JVB_HOSTNAME=$(echo "$RET" | xargs echo -n)
         if [ -n "$RET" ]; then
             rm -f /etc/prosody/conf.avail/$JVB_HOSTNAME.cfg.lua
             rm -f /etc/prosody/conf.d/$JVB_HOSTNAME.cfg.lua

debian/jitsi-meet-tokens.postinst

         . /usr/share/debconf/confmodule
 
         db_get jitsi-meet-prosody/jvb-hostname
-        JVB_HOSTNAME="$RET"
+        JVB_HOSTNAME=$(echo "$RET" | xargs echo -n)
 
         db_get jitsi-meet-tokens/appid
         if [ "$RET" = "false" ] ; then

debian/jitsi-meet-turnserver.postinst

             db_input critical jitsi-videobridge/jvb-hostname || true
             db_go
         fi
-        JVB_HOSTNAME="$RET"
+        JVB_HOSTNAME=$(echo "$RET" | xargs echo -n)
 
         TURN_CONFIG="/etc/turnserver.conf"
         NGINX_CONFIG="/etc/nginx/sites-available/$JVB_HOSTNAME.conf"
 
         # detect dpkg-reconfigure, just delete old links
         db_get jitsi-meet-turnserver/jvb-hostname
-        JVB_HOSTNAME_OLD=$RET
+        JVB_HOSTNAME_OLD=$(echo "$RET" | xargs echo -n)
         if [ -n "$RET" ] && [ ! "$JVB_HOSTNAME_OLD" = "$JVB_HOSTNAME" ] ; then
             if [[ -f $TURN_CONFIG ]] && grep -q "jitsi-meet coturn config" "$TURN_CONFIG" ; then
                 rm -f $TURN_CONFIG

debian/jitsi-meet-web-config.postinst

             db_go
             db_get jitsi-videobridge/jvb-hostname
         fi
-        JVB_HOSTNAME="$RET"
+        JVB_HOSTNAME=$(echo "$RET" | xargs echo -n)
 
         # detect dpkg-reconfigure
         RECONFIGURING="false"
         db_get jitsi-meet/jvb-hostname
-        JVB_HOSTNAME_OLD=$RET
+        JVB_HOSTNAME_OLD=$(echo "$RET" | xargs echo -n)
         if [ -n "$RET" ] && [ ! "$JVB_HOSTNAME_OLD" = "$JVB_HOSTNAME" ] ; then
             RECONFIGURING="true"
             rm -f /etc/jitsi/meet/$JVB_HOSTNAME_OLD-config.js

debian/jitsi-meet-web-config.postrm

     ;;
     purge)
         db_get jitsi-meet/jvb-hostname
-        JVB_HOSTNAME=$RET
+        JVB_HOSTNAME=$(echo "$RET" | xargs echo -n)
         if [ -n "$RET" ]; then
             rm -f /etc/jitsi/meet/$JVB_HOSTNAME-config.js
             rm -f /etc/nginx/sites-available/$JVB_HOSTNAME.conf