Fixing several bugs in assemble and updating tests

Bugfixes:
* the remote_src param was not being converted to a boolean correctly,
  resulting in it never being used by the module as the default behavior
  was remote_src=True (issue #5581)
* the remote_src param was not listed in the generic file params, leading
  to a failure when the above bug regarding remote_src was fixed
* the delimiter should always end with a newline to ensure that the file
  fragments do not run together on one line

Fixes #5581

files/assemble

@@ -107,7 +107,11 @@ def assemble_from_fragments(src_path, delimiter=None, compiled_regexp=None):
             continue
         fragment = "%s/%s" % (src_path, f)
         if delimit_me and delimiter:
-            tmp.write("%s\n" % delimiter)
+            tmp.write(delimiter)
+            # always make sure there's a newline after the 
+            # delimiter, so lines don't run together
+            if delimiter[-1] != '\n':
+                tmp.write('\n')
         if os.path.isfile(fragment):
             tmp.write(file(fragment).read())
         delimit_me = True