allow using args for start command in cmd_upgrade (eclipse-che#4332)

* allow using args for start command in cmd_upgrade

for now there is no way to pass any arg to start command on upgrade, but on our prod we must skip preflight checks because they will not work due to closed ports on firewall. those changes allow using `upgrade --skip-backup --skip:preflight`

dockerfiles/base/scripts/base/commands/cmd_upgrade.sh

@@ -30,14 +30,14 @@ post_cmd_upgrade() {
 cmd_upgrade() {
   CHE_IMAGE_VERSION=$(get_image_version)
   DO_BACKUP="true"
+  ARGS=""
 
-  while [ $# -gt 0 ]; do
-    case $1 in
-      --skip-backup)
-        DO_BACKUP="false"
-        shift ;;
-      *) error "Unknown parameter: $1; did you mean --skip-backup?" ; return 2 ;;
-    esac
+  for var in $@; do
+    if [[ "$var" == *"--skip-backup"* ]]; then
+              DO_BACKUP="false"
+              continue
+    fi
+    ARGS+="$var "
   done
 
   # If we got here, this means:
@@ -73,5 +73,5 @@ cmd_upgrade() {
   info "upgrade" "Reinitializing the system with your configuration..."
   cmd_lifecycle init --accept-license --reinit
 
-  cmd_lifecycle start
+  cmd_lifecycle start ${ARGS}
 }