Add configurable lock file path support for filesystem compatibility (#…

…491)

* Add configurable lock file path to decouple from TENV_ROOT
* Eliminate duplication and improve lockfile API design.

Signed-off-by: Lorenzo Buitizon <[email protected]>

improve signature skipping (#447)

* improve signature skipping #445
* update README for #445
* avoid unnecessary download #445
* fix linter : use CommandContext

Signed-off-by: Denis Vaumoron <[email protected]>