commit b0f1fe68c6883c0fac791b812732d26b3f178acd
author Todd Wang <toddw@google.com> Tue Apr 28 19:06:49 2015 -0700
committer Todd Wang <toddw@google.com> Tue Apr 28 19:06:51 2015 -0700
tree 4c02ff544404cd0968f6035ca011b838e0131c07
parent ebf8cfa7f834e2e9e7482956b1ce4602223ad188

lib: Rewrite depcop to check transitive dependencies.

This is rewrite of most depcop functionality.  I started out
simply wanting to change the implementation to check transitive
dependencies, but the original implementation was complicated and
hard to inject this feature.  So I've restructured things and
added more tests.

On the user side, I've removed "incoming" dependency checking,
since it doesn't provide enough benefits to outweigh the extra
complexity and configuration.  I've also simplified the format of
the GO.PACKAGES file as a result.

I've also updated all GO.PACKAGE files to follow the new
formatting, and to remove some unnecessary allowed dependencies.
After this is submitted we can go through and more methodically
restrict dependencies throughout v.io.

Closes vanadium/issues#394

MultiPart: 3/4

Change-Id: I14308edb899d01d1ee52c7e70010be3355b96711