if parent resolution fails when adding a project, it will never succeed until restart

scenario:

• set up a repository manager in ~/.m2/settings.xml that is not yet running
• start continuum
• attempt to add a maven 2 project that has a valid parent
• it will fail, since the parent can't be found
• start the repository manager, such that the parent is found at the right URL
• adding a project will still fail

It appears the resolution result is cached, and should never be for this scenario.

Restarting Continuum resolves the issue.