OP.item_create() broken: sub_cmd_args doesn't get added to arg

[zcutlip]

In v3.10.0 we broke item_create().

In _OPArgv.item_create_argv(), item_create_args doesn't get passed to item_generic_argv().

This causes multiple kinds of breakage:

• --template arg is omitted
• --generate-password arg omitted if provided
• --vault arg omitted if provided, which breaks service accounts

Fix should be easy. May do it straight in the development branch

[zcutlip]

Note: It would be great if we could devise a way to add item creation to offline automated testing so we catch these things