Replace deprecated ConfigParser.readfp() with read_file()

[dmach]

No description provided.

[dmach]

Could you make a new release any time soon?
osc doesn't build due to this: https://build.opensuse.org/package/show/OBS:Server:Unstable/osc

[   13s] Traceback (most recent call last):
[   13s]   File "/usr/lib/obs/service/tar", line 30, in <module>
[   13s]     main()
[   13s]     ~~~~^^
[   13s]   File "/usr/lib/obs/service/tar", line 26, in main
[   13s]     TarSCM.run()
[   13s]     ~~~~~~~~~~^^
[   13s]   File "/usr/lib/obs/service/TarSCM/__init__.py", line 39, in run
[   13s]     task_list.process_list()
[   13s]     ~~~~~~~~~~~~~~~~~~~~~~^^
[   13s]   File "/usr/lib/obs/service/TarSCM/tasks.py", line 119, in process_list
[   13s]     self.process_single_task(task)
[   13s]     ~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^
[   13s]   File "/usr/lib/obs/service/TarSCM/tasks.py", line 199, in process_single_task
[   13s]     self.scm_object = scm_object   = scm_class(args, self)
[   13s]                                      ~~~~~~~~~^^^^^^^^^^^^
[   13s]   File "/usr/lib/obs/service/TarSCM/scm/base.py", line 76, in __init__
[   13s]     self._calc_repocachedir()
[   13s]     ~~~~~~~~~~~~~~~~~~~~~~~^^
[   13s]   File "/usr/lib/obs/service/TarSCM/scm/base.py", line 234, in _calc_repocachedir
[   13s]     repocachedir = Config().get('tar_scm', 'CACHEDIRECTORY')
[   13s]                    ~~~~~~^^
[   13s]   File "/usr/lib/obs/service/TarSCM/config.py", line 47, in __init__
[   13s]     self.configs.append(self._init_config(fname))
[   13s]                         ~~~~~~~~~~~~~~~~~^^^^^^^
[   13s]   File "/usr/lib/obs/service/TarSCM/config.py", line 73, in _init_config
[   13s]     config.readfp(tmp_fp)
[   13s]     ^^^^^^^^^^^^^
[   13s] AttributeError: 'RawConfigParser' object has no attribute 'readfp'. Did you mean: 'read'?

[M0ses]

LGTM