The class is deprecated and there are only two plugins using it:
- high-availability: this plugin is targetted at 2.13.x and can be
adapted later to use the LightweightPluginDaemonTest
- project-group-structure: this plugin uses 2.14-SNAPSHOT, and can
be adapted later to use the LightweightPluginDaemonTest.
Since PluginDaemonTest still has a lot of code to handle both buck
and bazel, it's easier to just remove it than attempt to disentangle
it in order to get rid of the .primary_build_tool references.
Change-Id: Ib99faf5266c22934f1ee7f049b951e4f3dbebf87
be80a4ba4c