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Use same repository as repo2 for repo1
Add rack gem to base set

I haven't examined bundler to determine how the repo1 gems get set up
yet.  For now just create them by default as they're present before
this test runs on the bundler side.
Add bundler 0.9.2 to the default set

This allows "causes a conflict if explicitly requesting a different
version" to pass.
Add default gems for bundler specs

Allows "works for gems with multiple versions in its dependencies" to
pass.
Add default gems for install specs

Allows "causes a conflict if child dependencies conflict" to work but
with a different error message.  (So it still fails).