Fix test_server_software_config scenario test

In commit 4ca172ae78bc606b02150b07776b695f1b3a6678 we changed to
use heatclient utilities to load files and it broke this test.

File mode must be string from Puppet 4 onwards, so the inline
manifest also needs to be fixed.

Note: This test is not run in the gate.

Change-Id: Ia0be1aab36448b291ea43371a5d906fa79eb3753
2 files changed