Use Option's config_key for customizable dest branches in rbt land.
Review Request #6717 — Created Jan. 1, 2015 and submitted — Latest diff uploaded
rbt land had some custom code for allowing the destination branch to be specified in .reviewboardrc, but it was just re-implementing the logic that already lives in Option. Now we use Option's native support for this, simplifying rbt land.
Tested with just a command line argument.
Tested with just a config setting in .reviewboardrc.
Tested without any defaults.
For each, I altered the code to print the value and compared to my expected value.