builddeb: rename --release option to --codename

builddeb: rename --release option to --codename

Debian and Ubuntu releases have both codenames and traditional version numbers.
An entire "branch" of releases is referred to by its codename, and version
numbers (e.g. 8.2, 14.04.3) are used to address individual releases.

Since we use codenames for building .deb packages, let's call the option and
the variable appropriately.

--- a/Makefile	Wed Dec 02 12:19:01 2015 -0800
+++ b/Makefile	Wed Nov 25 14:59:43 2015 +0800
@@ -162,7 +162,7 @@
 
 deb:
 	mkdir -p packages/debian-unknown
-	contrib/builddeb --release unknown
+	contrib/builddeb --codename unknown
 
 docker-debian-jessie:
 	mkdir -p packages/debian-jessie

--- a/contrib/builddeb	Wed Dec 02 12:19:01 2015 -0800
+++ b/contrib/builddeb	Wed Nov 25 14:59:43 2015 +0800
@@ -8,12 +8,12 @@
 
 BUILD=1
 CLEANUP=1
-DEBVERSION=jessie
+CODENAME=jessie
 while [ "$1" ]; do
     case "$1" in
-    --release )
+    --codename )
         shift
-        DEBVERSION="$1"
+        CODENAME="$1"
         shift
         ;;
     --cleanup )
@@ -82,7 +82,7 @@
 fi
 if [ "$CLEANUP" ] ; then
     echo
-    OUTPUTDIR=${OUTPUTDIR:=packages/debian-$DEBVERSION}
+    OUTPUTDIR=${OUTPUTDIR:=packages/debian-$CODENAME}
     find ../mercurial*.deb ../mercurial_*.build ../mercurial_*.changes \
           -type f -newer $control -print0 | \
       xargs -Inarf -0 mv narf "$OUTPUTDIR"

--- a/contrib/dockerdeb	Wed Dec 02 12:19:01 2015 -0800
+++ b/contrib/dockerdeb	Wed Nov 25 14:59:43 2015 +0800
@@ -8,7 +8,7 @@
 
 checkdocker
 
-DEBPLATFORM="$1"
+CODENAME="$1"
 PLATFORM="debian-$1"
 shift # extra params are passed to build process
 
@@ -26,8 +26,8 @@
             sh -c "cd /mnt/$dn && make clean && make local"
 fi
 $DOCKER run -u $DBUILDUSER --rm -v $PWD/..:/mnt $CONTAINER \
-  sh -c "cd /mnt/$dn && DEB_BUILD_OPTIONS='${DEB_BUILD_OPTIONS:=}' contrib/builddeb --build --release $DEBPLATFORM"
-contrib/builddeb --cleanup --release $DEBPLATFORM
+  sh -c "cd /mnt/$dn && DEB_BUILD_OPTIONS='${DEB_BUILD_OPTIONS:=}' contrib/builddeb --build --codename $CODENAME"
+contrib/builddeb --cleanup --codename $CODENAME
 if [ $(uname) = "Darwin" ] ; then
     $DOCKER run -u $DBUILDUSER --rm -v $PWD/..:/mnt $CONTAINER \
             sh -c "cd /mnt/$dn && make clean"