Skip default products when template created from product

From msg55122, I think we should not set default products when creating template from product.
With #9023 (closed), we can use the search_context for that.

assigned to @ced

added product type::behavior + 1 deleted label

added 1 deleted label and removed 1 deleted label

review253011005 updated at https://codereview.tryton.org/253011005/#ps282881002

LGTM (display is different following the case, when creating template from search, variants "section" is hidden, when creating from "new" button, variants "section" is greyed, button + allowing to add a new variant)

New changeset 9581ad530d49 by Cédric Krier in branch 'default':
Skip default products when template is created from product
https://hg.tryton.org/modules/product/rev/9581ad530d49

added 1 deleted label and removed 1 deleted label

closed

New changeset c52845b62615 by Cédric Krier in branch 'default':
Skip default products when template is created from product
https://hg.tryton.org/tryton-env/rev/c52845b62615