vm-setup: add the config variable SKIP_SHARED_FOLDERS.

You can use it to skip the shared folders setup.

vm-setup

@@ -278,8 +278,10 @@ if [[ ${CREATE_VM} == 1 ]]; then
     fi
 
     # shared folders
-    VBoxManage sharedfolder add "${VM_NAME}" --name "${SF_LINUX_NAME}" --hostpath "${SF_LINUX_TARGET}" --automount
-    VBoxManage sharedfolder add "${VM_NAME}" --name "${SF_MEDIA_NAME}" --hostpath "${SF_MEDIA_TARGET}" --automount
+    if [[ -z "${SKIP_SHARED_FOLDERS}" ]]; then
+        VBoxManage sharedfolder add "${VM_NAME}" --name "${SF_LINUX_NAME}" --hostpath "${SF_LINUX_TARGET}" --automount
+        VBoxManage sharedfolder add "${VM_NAME}" --name "${SF_MEDIA_NAME}" --hostpath "${SF_MEDIA_TARGET}" --automount
+    fi
 
     # TWEAK enableIn and enabledOut audio attributes (5.2.x bug, enableOut does not get properly set)
     # we need to wait some time for the configuration to be written on disk before tweaking it