ipatests: strip newline character when getting name of temp file

Function create_temp_file was returning unprocessed output of mktemp
command, which contains a trailing newline. Callers which tryed to write
to the temp file were creating a new one instead.

Reviewed-By: Michal Polovka <mpolovka@redhat.com>

ipatests/pytest_ipa/integration/tasks.py

@@ -1870,7 +1870,7 @@ def create_temp_file(host, directory=None):
     cmd = ['mktemp']
     if directory is not None:
         cmd += ['-p', directory]
-    return host.run_command(cmd).stdout_text
+    return host.run_command(cmd).stdout_text.strip()
 
 
 def create_active_user(host, login, password, first='test', last='user'):