Expose Context key in profile as property and allow override in bookm…

[dkocher]

…ark.

[sannies]

look_at_preferences_all_the_time_parse_context_property_prevent_login_dialog_use_configure.patch

I believe this patch is neccessary.

1. HostDictionary needs to parse it - otherwise it's not visible
2. S3Session was not looking at/using the same value - fixed that inconsistency
3. AWSSessionCredentialsRetriever uses url property directly to fetch credentials to workaround issue with Hostparser
4. S3Protocol by-passes login dialogue when context is set (this one I'm not 100% sure if done correctly)

This change would help us a lot - it allows for a full integration of Cyberduck into some publishers' very manual processes when they deliver or retrieve content from Castlabs' software.

[dkocher]

look_at_preferences_all_the_time_parse_context_property_prevent_login_dialog_use_configure.patch

I believe this patch is neccessary.

1. HostDictionary needs to parse it - otherwise it's not visible
2. S3Session was not looking at/using the same value - fixed that inconsistency
3. AWSSessionCredentialsRetriever uses url property directly to fetch credentials to workaround issue with Hostparser
4. S3Protocol by-passes login dialogue when context is set (this one I'm not 100% sure if done correctly)

This change would help us a lot - it allows for a full integration of Cyberduck into some publishers' very manual processes when they deliver or retrieve content from Castlabs' software.

Please open as a pull request to allow it to be commented.