Set 'setKey' and 'webpwd' only on new installations.

Change debian postinst scripts to run some shell commands for setting
'setKey' and 'webpwd' parameter only if no weakforce is already installed
(or configurations are left). This is necessary because running these
commands if weakforce is already runnig they will fail and upgrading
exits with failure.
postinst maintainer script is only run _without_ additional arguments
beside 'configure' if it's a new installation.
See https://www.debian.org/doc/debian-policy/ch-maintainerscripts.html#summary-of-ways-maintainer-scripts-are-called

builder-support/debian/wforce-trackalert.postinst

@@ -16,11 +16,13 @@ case "$1" in
       adduser --quiet --system --home /var/spool/wforce --shell /bin/false --ingroup wforce --disabled-password --disabled-login --gecos "wforce" wforce
       echo "done"
     fi
-    echo -n "Modifying trackalert.conf to replace password and key..."
-    SETKEY=`echo "makeKey()" | trackalert | grep setKey`
-    WEBPWD=`dd if=/dev/urandom bs=1 count=32 2>/dev/null | base64 | rev | cut -b 2-14 | rev`
-    sed -e "s#--WEBPWD#$WEBPWD#" -e "s#--SETKEY#$SETKEY#" -i $TRACKALERTCONF
-    echo "done"
+    if [ -z "$2" ]; then
+        echo -n "Modifying trackalert.conf to replace password and key..."
+        SETKEY=`echo "makeKey()" | trackalert | grep setKey`
+        WEBPWD=`dd if=/dev/urandom bs=1 count=32 2>/dev/null | base64 | rev | cut -b 2-14 | rev`
+        sed -e "s#--WEBPWD#$WEBPWD#" -e "s#--SETKEY#$SETKEY#" -i $TRACKALERTCONF
+        echo "done"
+    fi
   ;;
 
   *)

builder-support/debian/wforce.postinst

@@ -28,11 +28,13 @@ case "$1" in
        mv /etc/wforce.conf /etc/wforce/wforce.conf && \
        echo "Moved /etc/wforce.conf to /etc/wforce/wforce.conf"
     fi
-    echo -n "Modifying wforce.conf to replace password and key..."
-    SETKEY=`echo "makeKey()" | wforce | grep setKey`
-    WEBPWD=`dd if=/dev/urandom bs=1 count=32 2>/dev/null | base64 | rev | cut -b 2-14 | rev`
-    sed -e "s#--WEBPWD#$WEBPWD#" -e "s#--SETKEY#$SETKEY#" -i $WFORCECONF
-    echo "done"
+    if [ -z "$2" ]; then
+        echo -n "Modifying wforce.conf to replace password and key..."
+        SETKEY=`echo "makeKey()" | wforce | grep setKey`
+        WEBPWD=`dd if=/dev/urandom bs=1 count=32 2>/dev/null | base64 | rev | cut -b 2-14 | rev`
+        sed -e "s#--WEBPWD#$WEBPWD#" -e "s#--SETKEY#$SETKEY#" -i $WFORCECONF
+        echo "done"
+    fi
   ;;
 
   *)