Drop CtsLibcoreJavaUtilCollectionTestCases.

While this module contains useful tests, the CTS test runner
infrastructure always had trouble running modules with this many
tests; they've been on the list of known failures for nearly a
year, so they're currently not providing value (bug 62616944).

To work around the limitations of the CTS framework, these tests
should probably run host-side instead (tracked by bug 62899665).
For now, this CL removes the nonfunctional CTS module.

Bug: 62616944
Test: Treehugger

Change-Id: Ica9be3b2d588ff63eb0c81e8542a45b870db4536
Merged-In: Ica9be3b2d588ff63eb0c81e8542a45b870db4536
15 files changed