Switch all remaining accesses of 'context.options' to new options.

Killed IvyUtils's dependency on options. It only needed it for
two options that no one is using in practice and this made things
much much simpler.

Also made some methods in IvyUtil classmethods, so that call sites
don't need to instantiate it and pass it config.

Testing Done:
All task unittests passed.

CI passed.

Reviewed at https://rbcommons.com/s/twitter/r/1289/
Sync of https://github.com/pantsbuild/pants/commit/55b731610a4ce60707cf66df1f55a7205e5dcd80