abrt-action-notify および abrt-action-generate-machine-id で発生している "ImportError: No module named argparse" 例外を修正する

Issue

ABRT が abrt-action-generate-machine-id におけるクラッシュに関するメールを多数配信しており、以下のようなメッセージでシステムログがいっぱいになります。

abrt: detected unhandled Python exception in '/usr/libexec/abrt-action-generate-machine-id'
abrt-server[18907]:Saved Python crash dump of pid 18906 to /var/spool/abrt/pyhook-2015-07-23-08:43:33-18906
abrtd:Directory 'pyhook-2015-07-23-08:43:33-18906' creation detected
abrtd:Duplicate: core backtrace
abrtd:DUP_OF_DIR:/var/spool/abrt/pyhook-2015-07-23-08:43:33-18906
abrtd:Deleting problem directory pyhook-2015-07-23-08:43:22-18675 (dup of pyhook-2015-07-23-08:43:33-18906)
abrtd:Sending an email...
abrtd:Email was sent to: root@localhost
abrtd:Duplicate: core backtrace
abrtd:DUP_OF_DIR:/var/spool/abrt/pyhook-2015-07-23-03:59:32-5493
abrtd:Deleting problem directory pyhook-2015-07-23-08:43:22-18687 (dup of pyhook-2015-07-23-03:59:32-5493)
abrt: detected unhandled Python exception in '/usr/bin/abrt-action-notify'
abrt-server[18918]:Saved Python crash dump of pid 18917 to /var/spool/abrt/pyhook-2015-07-23-08:43:34-18917
abrtd:Directory 'pyhook-2015-07-23-08:43:34-18917' creation detected
abrtd:Traceback (most recent call last):
abrtd:   File "/usr/bin/abrt-action-notify", line 18, in <module>
abrtd:     from argparse import ArgumentParser
abrtd:ImportError:No module named argparse