Pass force variant option at instance creation

This was supposed to be done in
"06073e85" but by mistake the field was
added to batch create rather than the normal instance create.
Signed-off-by: Guido Trotter <ultrotter@google.com>
Reviewed-by: Michael Hanselmann <hansmi@google.com>

lib/cli.py

@@ -1778,6 +1778,7 @@ def GenericInstanceCreate(mode, opts, args):
   if mode == constants.INSTANCE_CREATE:
     start = opts.start
     os_type = opts.os
+    force_variant = opts.force_variant
     src_node = None
     src_path = None
     no_install = opts.no_install
@@ -1785,6 +1786,7 @@ def GenericInstanceCreate(mode, opts, args):
   elif mode == constants.INSTANCE_IMPORT:
     start = False
     os_type = None
+    force_variant = False
     src_node = opts.src_node
     src_path = opts.src_dir
     no_install = None
@@ -1809,6 +1811,7 @@ def GenericInstanceCreate(mode, opts, args):
                                 mode=mode,
                                 start=start,
                                 os_type=os_type,
+                                force_variant=force_variant,
                                 src_node=src_node,
                                 src_path=src_path,
                                 no_install=no_install,