elements: zypper: Do not pull recommended packages

Recommended packages are usually useful but we normally don't need
them in order to have a working system. As a result, avoid pulling
them in when doing a regular package installation or a distribution
update. Extra packages can be pulled in using the usual '-p' parameter
or from within the elements that actually need them. The results of
this change are quite significant, resulting to gains from a few dozen
of MBs up to a few hundred depending on the selected elements.

Change-Id: I5838829c631990c7a1f3b67548accd9a603fe20c

elements/zypper/bin/install-packages

@@ -20,7 +20,7 @@ fi
 set -eu
 set -o pipefail
 
-EXTRA_ARGS=""
+EXTRA_ARGS="--no-recommends"
 MAP_ELEMENT=""
 ACTION=install
 
@@ -47,7 +47,7 @@ eval set -- "$TEMP"
 
 while true ; do
     case "$1" in
-        -u) run_zypper dist-upgrade; exit 0;;
+        -u) run_zypper dist-upgrade --no-recommends; exit 0;;
         -e) ACTION="remove"; shift;;
         -d) EXTRA_ARGS="--download-only"; shift;;
         -m) MAP_ELEMENT=$2; shift 2;;