Restore deep tool fingerprinting

Review Request #2955 - Created Oct. 9, 2015 and submitted

Information
Stu Hood
pants
2354
36a953f...
Reviewers
pants-reviews
areitz, jsirois, patricklaw

This patch restores "deep" tool target fingerprinting (such that changing the version of a tool target causes task invalidation). A more complete solution that changes the type of target_option and target_list_option to use Addresses is tracked by https://rbcommons.com/s/twitter/r/2937/

This broke in https://rbcommons.com/s/twitter/r/2778/ when the tool target switched from a list to a string, and the target_list_option type was dropped.

https://github.com/pantsbuild/pants/pull/2354

John Sirois
Andy Reitz
Stu Hood
Stu Hood
Stu Hood
Review request changed

Status: Closed (submitted)

Change Summary:

Merged as d724e24149d3cbcb347c21438311e13a329c3561

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