fixed lookup search path (#16630)

* fixed lookup search path

added ansible_search_path var that contains the proper list and in order
removed roledir var which was only used by first_found, rest used role_path
added needle function for lookups that mirrors the action plugin one, now
both types of plugins use same pathing.

* added missing os import

* renamed as per feedback

* fixed missing rename in first_found

* also fixed first_found

* fixed import to match new error class

* fixed getattr ref

lib/ansible/plugins/lookup/file.py

@@ -33,18 +33,11 @@ class LookupModule(LookupBase):
 
         ret = []
 
-        basedir = self.get_basedir(variables)
-
         for term in terms:
             display.debug("File lookup term: %s" % term)
 
-            # Special handling of the file lookup, used primarily when the
-            # lookup is done from a role. If the file isn't found in the
-            # basedir of the current file, use dwim_relative to look in the
-            # role/files/ directory, and finally the playbook directory
-            # itself (which will be relative to the current working dir)
-
-            lookupfile = self._loader.path_dwim_relative(basedir, 'files', term)
+            # Find the file in the expected search path
+            lookupfile = self.find_file_in_search_path(variables, 'files', term)
             display.vvvv("File lookup using %s as file" % lookupfile)
             try:
                 if lookupfile: