The json file is removed when installing a plugin

[Seraf]

On the line https://github.com/Seraf/LISA/blob/master/lisa/server/plugins/PluginManager.py#L115 the json is removed during the plugin install.
It is not a problem on production, but during plugin development it's annoying.
The CLI should take an optionnal argument to know it is a development context and do not delete this json file.
This development argument should also be used to install/uninstall easily the plugin without removing the directory, and playing with pip.

[Seraf]

The commit d32a307 should fix the issue.

[gdumee]

I confirm that this issue is fixed
Create : lisa-cli plugin --create <plugin_name>
Install : lisa-cli plugin --install <plugin_name> --dev
Uninstall : lisa-cli plugin --uninstall <plugin_name> --dev

[Seraf]

Thanks for the review :)