We should test bazel fetch ... on a clean repository

[damienmg]

See #1880 for more context.

[kchodorow]

I don't understand what test case you think is missing. We had a bunch of integration tests for fetch. fetch+android stuff?

[aj-michael]

Yes, we should put an android_binary in one of the fetch integration tests.

#1880 happened because tensorflow has an android_binary as a sample app and I accidentally introduced an implicit dependency from android_binary on something from the android_sdk_repository. So bazel fetch tensorflow/... failed inside ./configure if you didn't have an android_sdk_repository in the WORKSPACE.

[aj-michael]

bazel fetch //some/android:target will intentionally fail without an android_sdk_repository set up in the WORKSPACE as of 0b9ebfe. See #1819 (comment) for context on this decision. Tensorflow's use case was cleaned up in tensorflow/tensorflow#6225.