resource: remote resource resolution fixes

- "remote" getter priority reduced to be below "environment" so that
  resouces placed into "~/.workload_automation/dependencies" by the user
  take priority over those pulled from remote locations.
- "filer" getter now uses a cache location for the resource rather than
  downloading to the local resource location.

wlauto/core/resource.py

@@ -38,8 +38,8 @@ class GetterPriority(object):
     """
     cached = 20
     preferred = 10
-    remote = 5
     environment = 0
+    remote = -4
     external_package = -5
     package = -10