Use -y on zypper remove to avoid hanging

When using zypper remove, include the -y option to avoid stack.sh from
hanging waiting for user confirmation.  Due to output buffering, the
script could hang before giving the user the prompt to enter Y to
continue, making it unclear why the script was hanging.

Change-Id: I5ea761e5ae0829439953c385f8e7d0546acba886
Closes-Bug: 1642736
diff --git a/functions-common b/functions-common
index 8e14b5e..d5014fd 100644
--- a/functions-common
+++ b/functions-common
@@ -1318,7 +1318,7 @@
     elif is_fedora; then
         sudo ${YUM:-yum} remove -y "$@" ||:
     elif is_suse; then
-        sudo zypper rm "$@" ||:
+        sudo zypper remove -y "$@" ||:
     else
         exit_distro_not_supported "uninstalling packages"
     fi