Service: Clean up the use of the keyring_*_credentials filters to make sure that they're uniquely named when they are doing different things.


git-svn-id: https://plugins.svn.wordpress.org/keyring/trunk@891576 b8457f37-d9ea-0310-8a92-e5e31aec5664
OAuth1: Allow filtering of request scope, abstract out prepare_request()


git-svn-id: https://plugins.svn.wordpress.org/keyring/trunk@891577 b8457f37-d9ea-0310-8a92-e5e31aec5664