Changed recipe_modules base paths to be abstract entities in their own right.

scripts/slave/recipes/gpu/build_and_test.expected/win_release_fyi.json

 [
   {
     "cmd": [
       "python",
       "-u",
       "[BUILD]\\scripts\\slave\\cleanup_temp.py"
     ],
     "name": "cleanup temp"
   },
   {
@@ skipping 67 matching lines @@
     ],
     "env": {
       "GYP_DEFINES": "archive_gpu_tests=1 blink_logging_always_on=1 chromium_win_pch=0 component=static_library dcheck_always_on=1 fastbuild=1 ffmpeg_branding=Chrome gomadir='[BUILD]\\goma' internal_gles2_conform_tests=1 proprietary_codecs=1 target_arch=ia32 test_isolation_mode=prepare use_goma=1"
     },
     "name": "gclient runhooks"
   },
   {
     "cmd": [
       "python",
       "-u",
-      "[BUILD]\\scripts\\slave\\recipe_modules\\isolate\\resources\\find_isolated_tests.py",
+      "RECIPE_MODULE[isolate]\\resources\\find_isolated_tests.py",
       "--build-dir",
       "[SLAVE_BUILD]\\src\\out\\Release",
       "--clean-isolated-files"
     ],
     "name": "clean isolated files"
   },
   {
     "cmd": [
       "python",
       "-u",
@@ skipping 904 matching lines @@
       "[SLAVE_BUILD]\\src\\tools\\swarming_client\\run_isolated.py",
       "-H",
       "[dummy hash for media_unittests]",
       "-I",
       "https://isolateserver.appspot.com",
       "--"
     ],
     "name": "media_unittests"
   }
 ]