Implement uploading of issue states from plugins

[aapomm]

Prerequisite: #679

Spec

With the implementation of issue states, we need to implement a way for users to automatically set issue states when uploading from plugins. Otherwise, they will have to manually set each issue to their desired state.

Proposed solution

Implement a dropdown in the uploads view that sets the incoming findings’ state.

How to test

Required plugin PR's:

• Projects: Import export issue states dradis-projects#50
• Plugins: Issue states dradis-plugins#36

Before testing, pull all the necessary branches of CE and the plugins and update the Gemfile to point to the plugins local directory:

gem 'dradis-plugins', path: '<local_directory>'
gem 'dradis-projects', path: '<local_directory>'

Then run bundle install to install the local plugins.

1. Go to the uploads page
2. Select a plugin (nessus, netsparker, etc.)
3. Select a state
4. Upload a sample plugin file
5. Confirm that the created issues have the selected state

[brianp]

Closing old PR. Feel free to re-open with a card and move into the pipeline.