change fix to lookup path with get_bin_path

system/setup

@@ -1641,16 +1641,8 @@ def run_setup(module):
     # Look for the path to the facter and ohai binary and set
     # the variable to that path.
 
-    facter_path = None
-    ohai_path = None
-
-    for dir in os.environ['PATH'].split(':'):
-        facter = os.path.join(dir, 'facter')
-        if os.path.exists(facter):
-            facter_path = facter
-        ohai = os.path.join(dir, 'ohai')
-        if os.path.exists(ohai):
-            ohai_path = ohai
+    facter_path = module.get_bin_path('facter')
+    ohai_path = module.get_bin_path('ohai')
 
     # if facter is installed, and we can use --json because
     # ruby-json is ALSO installed, include facter data in the JSON